this sort of **** happens to me ALL the ****ing time.

my usual is to yell "wrong way" with either "buddy" or "******bag" tacked on at the end.. no one's ever really been too upset with me for saying this, but it's still frustrating as ****. as rustang says, it's not like them simply owning whatever beat-ass bike they're on gains them my undying love & respect. they're the reason people don't think cyclists know what they're doing; if i were in your place (and keep in mind, i've been on a hugely antagonistic, confrontational streak lately), i'd like to think i'd have not let it slide. but you're probably a better person than me because you did.