Red Bull challenge
At a party a few years back, my good friend Dave was dared to drink 8 cans of Red Bull in 5 minutes. A large crowd gathered and Dave, always the showman, attacked the cans with gusto. After less than 2 minutes he was 4 cans in, and looking good to reach the finish line in style. However, his stomach had other ideas. With the 5th can opened and ready to go, he suddenly paused. A mighty belch... and then...

BLAAAAAAGH! Red Bull and stomach lining everywhere. To his credit, after the vomiting began, he continued to attempt to drink the other cans. This resulted in a good 2 and a half minutes of Dave alternating between taking gulps of Red Bull and then having his body reject them instantly, much to the delight (and disgust) of all spectators. When the final bell was sounded Dave had failed, but he received a standing ovation from the crowd and spent the rest of the night telling people that he was 'fucking buzzing, man!'. I later found out that the crazy bastard hadn't even eaten that day.
(T.A.F.K.A. doctorsax http://www.badphorm.co.uk, Sat 3 Nov 2007, 12:01, Reply)