It's very clear, based on peoples' behavior in riots and political parties that there's a multiplier effect of acting stupid that comes from being in a group. To put it in another way, the larger the group, the greater the likelihood of Olympic-class stupid behavior.
Last weekend members of a fraternity at the University of Tennessee had a boozy party; and several of the worthies had overindulged by giving themselves alcohol enemas! You read that right: booze in the tush. It's called "butt chugging." But here's the story from the Knoxville paper:
This sort of makes the sorority episode seem small by comparison: