When I was in college our RA told us of a good one that (supposedly) some friends had pulled a couple of years earlier.

When I was in college our RA told us of a good one that (supposedly)
some friends had pulled a couple of years earlier. These two guys made
up a concoction of all kinds of left overs, semi-pureed it in a blender,
and filled a hot water bottle with it. One of them took the hot water
bottle, taped it to his stomach inside of his shirt and put a short
piece of hose into the top so that it came up to the front of his shirt
collar, but not visible. They both went to a local pub and sat at the
bar, acting already slightly intoxicated. After having a couple of beers
the guy with the hot water bottle says that he is feeling sick a couple
of times and "barfs" VERY loudly all over the bar to attract attention.
Naturally this causes the patrons to move away from him, all except his
buddy, who calmy pulls a fork out of his coat pocket and begins EATING
the stuff. ;-) I don't know how true it is, but I'd love to have been
there watching faces if it was...