Pretty new to the bar scene since I turned 21 in May, but I've gone a good amount to know my favorites.
Outside of whatever's on sale or whatever I like to get beer (Alaskan Amber is my #1 favorite) or vodka + soda. I play it pretty safe with what I buy at bars. So far at least.
The cheap stuff duh, usually beer, kamikazes, vodka bombs, LITs, or shots. I know some people really love like the slushies whenever they're around or liquid marijuana.