Disneyland is commonly known as the “Happiest Place on Earth,” but when the park opened on July 17, 1955, it didn’t live up to its now-ubiquitous nickname. In fact, Disney employees who survived the day refer to it as “Black Sunday.” On the 65th anniversary of the park's opening, here are some of the most disastrous things that went wrong.

1. Fake tickets flooded the park.

Walt Disney shows Disneyland plans to Orange County officials in December 1954. Orange County Archives via Flickr // CC BY 2.0

Disneyland’s opening day was “invite only” and not for public consumption. Tickets were mailed out and only reserved for special guests, including friends and family of employees, the press, and celebrities, such as Jerry Lewis, Debbie Reynolds, Sammy Davis, Jr., and Frank Sinatra. However, scores of counterfeit tickets were widespread on opening day. Disneyland was only expecting about 15,000 guests in total, but more than 28,000 people entered the park.

In addition, there were two sets of tickets with designated times: one for the morning and one for the afternoon. The time to leave Disneyland was printed on each ticket, so if it read 2:30 p.m., you were supposed to leave the park at that time to make way for the afternoon ticket holders to come in. Unfortunately, the morning ticket crowd didn’t leave, so attendance ballooned when the afternoon attendees were admitted.

There was even some money to be made from Disney's woes: one man set up a ladder outside one of the park's fences and charged $5 per person to climb it and sneak in.

2. Traffic was backed up for miles.

Since Disneyland and the city of Anaheim were not prepared for the amount of people that showed up, California's Santa Ana Freeway that led into the park was backed up for seven miles. The traffic essentially shut down the freeway for hours. In fact, people were in their cars for so long that when they finally made it to Disneyland, there were reports of families taking restroom breaks in the parking lot and on the side of the freeway.

3. The park was covered in wet paint and weeds.

Completing Disneyland was a race to the finish. Walt Disney wanted a quick turnaround, and it took exactly one year and one day from announcement to opening day, with construction crews working around-the-clock to meet their deadlines.

However, once the doors opened, guests could easily see that it was not completely finished. Workers were still painting structures and planting trees all over the park. Along the Canal Boats of the World (now the Storybook Land Canal Boats), weeds had yet to be removed from the riverbanks. And instead of landscaping the area, Walt Disney simply added signs with Latin plant names printed on them to make it look like they were meant to be there.

In addition, a number of rides were still under construction like Tomorrowland’s Rocket to the Moon, which showed a glimpse of what routine space travel would look like in the distant future of ... 1986.

4. Visitors wiped out the park's food and drink supply within hours.

For the lucky people who made it into Disneyland on opening day, they experienced a shortage of food and beverages in every restaurant and concession stand in the park. Because of the unexpected influx of guests, virtually all food and drink inventory was wiped out within hours.

5. There was a plumber's strike.

While there were plenty of water fountains on site, many of them were not working because of a plumbers’ strike during construction. Walt Disney had to choose between working water fountains or working restrooms for Disneyland on opening day, so he picked the latter because he felt the toilets were more important.

“A few weeks before the opening, there was a major meeting,” Dick Nunis, chairman of Walt Disney Attractions, explained to WIRED. “There was a plumbing strike. I’ll never forget this. I happened to be in the meeting. So the contractor was telling Walt, ‘Walt, there aren’t enough hours in the day to finish the restrooms and to finish all the drinking fountains.’ And this is classic Walt. He said, ‘Well, you know they could drink Coke and Pepsi, but they can’t pee in the streets. Finish the restrooms.’”

6. The weather was scorching hot.

Although Walt Disney had no control over the weather, it contributed to the disastrous opening day experience at Disneyland. Temperatures reached an intense 100 degrees, which must have been unbearable in a park without working water fountains. The day was so hot that the fresh asphalt became like a sticky tar, with guests complaining that they were getting their shoes and high heels stuck in the pavement of Main Street, U.S.A.

7. The rides kept breaking down.

Like so many of the other workers toiling to make Walt Disney's one-year deadline, both Disney Imagineers and construction workers rushed to complete the theme park. As a result, a number of rides—including Peter Pan’s Flight, 20,000 Leagues Under the Sea: Submarine Voyage, and Dumbo the Flying Elephant in Fantasyland—broke down or were closed altogether because they simply were not finished yet.

The growing pains didn’t stop on opening day. During the first few weeks after opening, the stagecoach ride in Frontierland permanently closed when it was discovered it would flip over if it was too top-heavy; 36 cars in Autopia crashed due to aggressive driving (ironically the ride was designed to help children learn respectful rules of the road); and a tiger and a panther escaped from the circus attraction, which resulted in a “furious death struggle” between the animals on Main Street, U.S.A.

8. The Mark Twain Riverboat sank.

The iconic Mark Twain Riverboat in Frontierland was filled way over capacity on opening day, with about 500 people cramming into the attraction. This caused the boat to go off its track and sink in the mud, but the ordeal was far from over.

"It took about 20 to 30 minutes to get it fixed and back on the rail and it came chugging in," Terry O'Brien, who was working the ride on opening day, later recalled in an interview. "As soon as it pulled up to the landing, all the people rushed to the side to get off, and the boat tipped into the water again, so they all had to wade off through the water, and some of them were pretty mad."

9. Sleeping Beauty's Castle almost caught fire.

A gas leak in the park prompted the closing of Adventureland, Fantasyland, and Frontierland for a few hours, while flames from the leak were seen trying to engulf Sleeping Beauty’s Castle. Walt Disney was so busy during opening day that he didn’t learn about the fire until the following day.

10. ABC's live show from Disneyland was a trainwreck.

Walt Disney had a partnership with the broadcast network ABC, which helped finance Disneyland with an investment of $5 million of the park’s $17 million price tag. In return, Walt Disney would host a weekly TV show about what people could expect to see in Disneyland, a full year before it was set to open its doors.

On opening day, Walt Disney hosted a 90-minute live TV special with co-hosts Art Linkletter, Bob Cummings, and future president Ronald Reagan. Over 90 million viewers tuned in to see the “Happiest Place on Earth.” And while the cameras showed the fun and excitement of Disneyland, the TV special obscured the numerous disasters described above.

However, the live broadcast itself was riddled with technical difficulties, such as guests tripping over camera cables all over the park, faulty miscues, on-air flubs, hot mics, and unexpected moments that were caught on camera—namely Bob Cummings caught making out with a dancer just before going on air.

“This is not so much a show, as it is a special event,” Art Linklater said during the live broadcast from Disneyland. “The rehearsal went about the way you'd expect a rehearsal to go if you were covering three volcanoes all erupting at the same time, and you didn't expect any of them. So, from time to time, if I say, ‘We take you now by camera to the snapping crocodiles in Adventureland,’ and instead, somebody pushes the wrong button, and we catch Irene Dunne adjusting her bustle on the Mark Twain, don't be too surprised.”

The live broadcast also featured the debut of the original Mouseketeers from The Mickey Mouse Club TV show, which premiered a few months later in 1955 on ABC. So at least something positive came out of all of it.