Coke, because I was forced to drink nothing but Pepsi for four years straight.

I went to college in upstate NY. The entire campus, from food court to the vending machines in the stairwell of the Engineering building, were all Pepsi machines - Pepsi had obviously signed a deal with the NY state university system to be their exclusive beverage supplier. You had to go off campus for a goddamn Coke. Hell I didn't even like one over the other particularly but after having nothing but Pepsi products for four years of your life, goddamn it if I don't want a Coke now.