Once upon a time I saw a metal band called Skitzo, whose lead singer apparently has some problem with his digestive tract. Their gimmick is to get a chick from the audience (or a pre-planned girl, whatever) and at some point during the show, he pulls her up on stage, rips off her shirt and pukes this vile green concoction all over her tits.
My friend Jessica undertook this assignment, but she's a non-ho and covered her nipples with electrical tape. Anyway, this guy must've shotgunned at least 2 liters of green schmag all over her, and he does it by drinking whatever mixture it is before the show, and he can hurl on command.
And for the curious, their music sucks ass, but I got the guy's autograph.