When I was in high school, I used to sit a certain way so I could make my hand numb. Once it was numb, I would hold hands with myself and pretend it was someone else since I couldn't feel the other hand.
I ordered two large pizzas on a buy one get one free deal and ate them over the course of 3 days, after i paid the guy i said 'hey guys the pizzas here' to the empty room.
I bought 50 chicken McNuggets at McDonald's, and when she asked me what sauce I wanted I replied with "Oh crap, she didn't specify, I guess just one of each..."