I usually grab two packages of Walker's Shortbread for one of my coworkers and a few Milanos for myself for the upcoming flight if it's not a meal flight. In the clubs that have refrigerators with canned sodas, I'll grab a diet coke to consume on the way to the gate as well ... but that's about it.

Making off with 24 cans of soda is pretty tacky, although I know a guy that would probably do that (who also happens to be a GS on United )