When I was little, my parents taught me how to stick out my tongue and make farting noises at commercials, and I never quite got over it.
The following story is old news, (1998), but it's new to me:
Coca-Cola ran a competition asking several schools to come up with a strategy for distributing Coke coupons to students. The prize was $500. Greenbriar High School in Evans, Georgia went so far as to call for an official Coke Day, with every one wearing branded T-shirts and listening to the lectures of visiting company executives. 19-year-old Mike Cameron, (wonder what he's doing now...), was discovered to be wearing a Pepsi shirt, and was promptly suspended.