Growing up in the royal family, it's fair to say Princes William and Harry probably had a slightly different upbringing than the rest of us. However, it's well documented that Princess Diana did everything in her power to give them as many 'normal' experiences possible.
One of the most exciting things from many people's childhoods is being allowed to order naughty food and watch whatever they wanted on TV, and the same goes for Harry and Wills.
It's no secret that Diana loved taking her boys to McDonald's, with the princess regularly tucking into a Big Mac and fries during weekends spent with the princes.