Find yourself always saying 'keep the receipt?' According to an ex McDonald's employees, you could be missing out on getting the best possible experience fast food experience.

If you've developed the reflex of turning down your receipt every time you pop by over to McDonald's for a cheeky Big Mac, you may want to break the habit immediately.

A former employee spills the beans

After making your order at McDonalds, don’t hesitate to ask for your receipt - it could be pretty important to you.

The reason? Simple: if you ask for your receipt, employees may think you could be a mystery shopper, meaning a customer paid by the company to try out the restaurant.After their visit, these mystery shoppers make a report about what they didn’t like so that the restaurant can improve on these weak points for normal customers.

McDonalds employees are therefore more attentive to clients who ask for a receipt (mystery shoppers ask for a receipt so that they can be reimbursed later) and serve them the warmest and freshest sandwiches and fries as possible.