[Lupin1]

Next time you eat something when you're alone, stop eating in the middle of it and pour it down your pants like a bully did it in the school cafeteria. Insult yourself about it a few times and then really make your point by giving yourself a nice wedgie. No changing for at least three hours to simulate the amount of time you'd have to wait before you could get home from school to change. Maybe even give yourself another wedgie or two in the time if you run into your imaginary bully in the hallways.