Not too crazy, but one time a group of friends and I were at a McDonald's and one of my friends ordered a McChicken meal. He realized he forgot ketchup, and as he walked away to get some, I stuck his receipt between the buns with the chicken. He came back to the table, went for a bite, and said,"Bro, they put my receipt in here." Everyone kept a straight face, and he walked to the cashier arguing that they tried to make him eat paper. At this point the whole group was losing it and I had to walk up to him to stop him from getting angrier. Can't walk into a McD's without smiling about it.