quarters, caps, flip cup, kings, beruit, etc.
on my floor whenever we play a drinking game, we also play "dink dank dunk," in which you can't say the words drink, drank, or drunk.  if you do, you have to have 1 drink.  if you really want to fuck over your friends, don't call them on saying drink/drank/drunk right away, instead, do something like this:
friend (to another person): haha fucker you lose, you have to drink.
you: he has to what?
friend: drink
you: what?
friend: drink.... oh fuck. (