A McDonald's customer recently posted on social media about why you should always keep hold of your receipt, as you may find a nice surprise printed on it.
While it's probably the last thing on your mind when you're stuffing your face with chips, it turns out that little slip of paper could save you some money.
Posting a photo on the Extreme Couponing and Bargains Facebook page, one thrifty diner explained how keeping the receipt could get you a cut price Big Mac and fries.
They said: "MCDONALD'S HACK. Don't throw your receipt and use it for the discount. I always keep Mcd receipts in my wallet for use it in the future
"Doing the survey doesn't take more than 2 mins.
"£1.99 for Big Mac + medium Fries (yes you have option to change the burger). Sometimes I change it to Quarter Pounder. Big Mac + Fries without receipt= £3.09 + 1.19 = £4.28. With receipt = £1.99 You save £2.29.
"If you and your partner use same hack (yes you need 2 receipts on separate orders) you can save £2.29 x 2 = £4.58. Enjoy!!"
The popular fast food chain recently announced it would be bringing back a few favourites this summer - as well as the ever-popular McDonald's Monopoly promotion.
The Big Tasty will be back on the menu this summer, as well the Big Tasty with Bacon. You will also soon be able to order Mozzarella Sticks again, as well as the Chicken BBQ Smokehouse Burger and a Cadbury's Crème Egg McFlurry.
As for the Monopoly game, that's returning after a year off because of... well, you-know-what.
The fast food giant confirmed the return on the official McDonald's Twitter account, writing: "The news you've all been waiting for... Monopoly returns Summer 2021."
The news you've all been waiting for...
Monopoly returns Summer 2021 pic.twitter.com/cajXI6lGoR
- McDonald's UK (@McDonaldsUK) March 22, 2021
Obviously it wasn't an option last year with all the restaurants closed, but it has appeared in the spring of every year since 2005, and now it is coming back.
It allows customers to collect game tokens with their orders and stand a chance of winning everything from free food to large cash prizes.
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