There's a good chance you never even glance at your McDonald's receipt after the cashierhands it to you, but you should still ask for one every single time you place an order,according to one McDonald's employee.Kamran Adnan, a Quora poster who claimed to have been employed by the Golden Arches inLondon for over a year, said asking for receipt is a surefire way to alert your cashier thatyou may be a secret shopper — therefore ensuring you're treated like royalty for theentirety of your visit.He said: It is easy to spot a gapbuster because they always ask for a receipt, adding thatsecret shoppers usually ask for proof of payment so they can be reimbursed for their meal bytheir employers.Considering most customers aren't concerned with documenting their Big Mac purchases,it does make sense.According to Adnan, it works especially well if you visit the restaurant during peak hours.He explained:Basically between 12-2 and 5pm-7pm workers have to be extra careful because that is whengapbusters (mystery shoppers), who are paid, visit McDonald's restaurants and rate theirexperience.This then goes to the overall store rating and every store manager will do everythingto ensure this rating is as positive as possible.That's pretty helpful information, especially since those are also the times you can usuallycount on the longest wait for your food — and sometimes the sloppiest sandwich.So what exactly do you get when McDonald's employees think you're working undercover?According to Adnan, you'll get fresh food, hot fries, and priority over the other customers.That's one way to make sure you get the most out of your lunch hour — even if doing itmakes you feel like a Hamburglar.The Hamburgler is very clever, and very sneaky.