While there’s virtually no end to the number of fast food options for people seeking a quick meal, none have entered the public consciousness quite like McDonald’s. Originally a barbecue shop with a limited menu when it was founded by brothers Richard and Maurice McDonald in the 1940s, the Golden Arches have grown into a franchised behemoth with more than 36,000 locations worldwide.

Staffing those busy kitchens and registers are nearly 2 million McDonald's employees. To get a better idea of what many consider to be the most popular entry-level job in the nation—staff members on the floor make an average of $9 an hour—we asked several workers to share details of their experiences with errant ice cream machines, drive-through protocols, and special requests. Here’s what they had to say about life behind the counter.

1. McDonald's employees can't always deliver fast food all that fast.

While McDonald’s and other fast-service restaurants pride themselves on getting customers on their way, some menu items just don’t lend themselves to record service times. According to Bob, an assistant store manager at a McDonald’s in the Midwest, pies take an average of 10 to 12 minutes to prepare; grilled chicken, 10 minutes; and biscuits for Egg McMuffins, eight to 10 minutes. In the mood for something light, like a grilled chicken and salad? That will take a few minutes, too. Bob says salads are pre-made with lettuce but still need to have chicken and other ingredients added.

The labor-intensive nature of assembling ingredients is part of why the chain has more recently shied away from menu items with too many ingredients. “We are trained to go as fast down the line as we can, and if we have to stop to make something that has 10 ingredients, it tends to slow things down,” Bob tells Mental Floss. “Corporate has realized this and has taken many of these items off in recent years, [like] McWraps, Clubhouse, more recently the Smokehouse and mushroom and Swiss and moved to items that can go a lot quicker.”

2. McDonald's workers wish you’d stop asking for fries without salt.

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A common “trick” for customers seeking fresh fries is to ask for them without salt. The idea is that fries that have been under a heating lamp will already be salted and that the employee in the kitchen will need to put down a new batch in the fryer. This does work, but customers can also just ask for fresh fries. It’s less of a hassle and may even save employees some discomfort.

“People can ask for fresh fries and it's actually way easier to do fresh fries rather than no-salt fries,” Andy, an employee who’s worked at three different McDonald’s locations in the Midwest, tells Mental Floss. “For those, we have to pour the fries onto a tray from the fryer so they don't come in contact with salt. It can get awkward sometimes getting everything into position, especially if you have a lot of people working in close proximity and it's busy, so I've had some scalded hands a couple of times trying to get fries out in a timely way.”

3. McDonald's workers have to pay careful attention to the order of ingredients.

McDonald’s is pretty specific about how their burgers and other items are supposed to be assembled, with layers—meat, cheese, sauce—arranged in a specific order. If they mess it up, customers can notice. “In some cases it has a big impact,” Sam, a department manager and nine-year veteran of the restaurant in Canada, tells Mental Floss. “Like placing the cheese between the patties with a McDouble. If they don’t put the cheese between the patties, the cheese won’t melt.”

4. There’s a reason McDonald’s employees ask you to park at the drive-through.

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After ordering at the drive-through window, you may be slightly puzzled when a cashier asks you to pull into one of the designated parking spots. That’s because employees are measured on how quickly they process cars at the drive-through. If your order is taking a long time to prepare, they’ll take you out of the queue to keep the line moving. “My store has sensors in the drive-through that actually tell us exactly how long you are at each spot in the drive-through,” Bob says. “We get measured based on something we call OEPE. Order end, present end. [That measures] from the second that your tires move from the speaker until your back tires pass over the sensor on the present window. My store is expected to be under two minutes.” If an order will take longer than that, you'll be asked to park.

5. The McDonald's drive-through employees can hear everything going on in your car.

While the quality of the speakers at a drive-through window can vary, it’s best to assume employees inside the restaurant can hear everything happening in your car even before you place an order. “The speaker is activated by the metal in the car, so as soon as you drive up, the speaker turns on in our headset,” Andy says. “We can hear everything, and I do mean everything. Loud music, yelling at your kids to shut up, etc.”

6. The employees at McDonald’s like their regulars.

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With hot coffee, plenty of tables, Wi-Fi, and newspapers, McDonald’s can wind up being a popular hang-out for repeat customers. “[We have] a ton of regulars who come into my store,” Bob says. “I'd say at least 75 percent of my daily customers know us all by name and we know them all, too. It makes it nice and makes the service feel a lot more personal when a customer can walk into my location, and we can look them in the eye and say, ‘Hey Mark! Getting the usual today?’ and we've already started making his coffee exactly how he takes it.”

7. McDonald’s staff get prank calls.

Unless they’re trying to cater an event, customers usually don’t have any reason to phone a McDonald’s. When the phone rings, employees brace themselves. In addition to sometimes being asked a legitimate question like when the store closes, Sam says his store gets a lot of prank calls. “Sometimes it’s people asking about directions to Wendy’s,” he says. “A lot of inappropriate ones. Most are pretty lame.”

8. For a McDonald’s worker, the ice cream machine is like automated stress.

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The internet is full of stories of frustrated McDonald’s customers who believe the chain’s ice cream machines are always inoperable. That’s not entirely true, but the machine does experience a lot of downtime. According to Bob, that’s because it’s always in need of maintenance. “The thing is, it is a very sensitive machine,” he says. “It's not made to be making 50 cones in a row, or 10 shakes at a time. It takes time for the mix to freeze to a proper consistency. It also requires a daily heat mode, [where] the whole machine heats up to about 130 degrees or so. The heat mode typically takes about four hours to complete, so you try to schedule it during the slowest time.” Stores also need to take the machine entirely apart every one to two weeks to clean it thoroughly.

Bob adds that the machine’s O-rings can crack or tear, rendering the unit inoperable. Seasoned workers can tell if a unit is faulty by the consistency of the shakes or ice cream coming out, and sometimes by the noises it makes.

9. McDonald's employees don't mind if you order a grilled cheese.

Contrary to rumor, there’s no “secret menu” at McDonald’s. But that doesn’t mean you can’t sometimes snag something not listed on the board. Andy says a lot of people order a grilled cheese sandwich. “I've made many a grilled cheese before,” he says. But it’s not without consequences. “Sometimes it can get a bit risky doing it because the bun toaster wasn't designed to make grilled cheeses so sometimes you get some burnt buns or cheese or the cheese sticks inside and it slows down the other buns from getting out on time so that causes more burnt buns.”

Another common request is for customers to ask for a McDouble dressed as a Big Mac, with added Big Mac sauce and shredded lettuce. “I think [it’s] a way more practical way to eat a Big Mac since there's less bun in the way, and it's also way cheaper even if you do get charged for Mac sauce.”

10. McDonald’s workers recommend always checking your order.

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Nothing stings worse than the revelation that an employee has forgotten part of your food order. Contrary to popular belief, it’s not because the employees are being lazy or inattentive. According to Bob, it’s simply due to the volume of customers a typical location has to process in a given day. “We are human,” he says. “Mistakes do happen. We always feel terrible when they do but when we serve 1000-plus people a day, it's bound to happen.”

Bob recommends checking your bag before leaving the restaurant and not taking it personally if there’s an issue. “Be nice to us if you have a problem,” he says. “It's a huge difference between coming to us and saying, ‘Hey, I seem to be missing a fry from my bag,’ and ‘You bastards didn't give me my fries!’” If you want to check your bag at the drive-through, though, he recommends trying to pull ahead so cars behind you can move forward.

11. McDonald's employees don't recommend the grilled chicken.

If a menu item isn’t all that popular, it can wind up experiencing a low rate of turnover. Of all the food at McDonald’s, the most neglected might be the grilled chicken. Because it doesn't move quickly, workers find that it can turn unappetizing in a hurry. “That stuff has a supposed shelf life of 60 minutes in the heated cabinet, but it dries out so quickly that even if it's within an acceptable time frame, it looks like burnt rubber, and probably tastes like it, too,” Andy says.

12. Golden Arches employees aren’t crazy about Happy Meal collectors.

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Happy Meals are boxed combos that come with a toy inside. Usually, it’s tied into some kind of movie promotion. That means both Happy Meal collectors and fans of a given entertainment property can swarm stores looking for the product. “The biggest pain involving the Happy Meals is the people who collect them,” Bob says. “I personally hate trying to dig through the toys looking for one specific one. We usually only have one to three toys on hand. It's especially a pain in the butt during big toys events such as the Avengers one we just had. There was like 26 different toys, and some customers get really mad when you don't have the one that they want.”

And no, employees don’t usually take home leftover toys. They’ve saved for future use as a substitute in case a location runs out of toys for their current promotion.

13. McDonald's employees can’t mess with Monopoly.

The McDonald’s Monopoly promotion has been a perennial success for the chain, with game pieces affixed to drink cups and fry containers. But if you think employees spend their spare time peeling the pieces off cups looking for prizes, think again. Following a widely-publicized scandal in 2000 that saw an employee of the company that printed the pieces intercepting them for his own gain, the chain has pretty strict rules about the promotion. “Monopoly pieces and things like them get sent back to corporate,” Bob says. “We aren't allowed to touch them, open them, or redeem them as employees.”

14. One McDonald's worker admits there have been sign mishaps.

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Many McDonald’s locations sport signs under the arches advertising specials or promotions. Some are analog, with letters that need to be mounted and replaced. Others have LED screens. Either way, there can be mistakes. “I've never seen anyone mess around with the letters,” Andy says. “But I do remember one time we were serving the Angus Burgers and the ‘G’ fell off of the word ‘Angus.’ Good times.”