The funny thing about the rankings are that they are decided by the students at each school. Your school only gets up there is enough people actually write into Playboy and nominate their school.
We (Washington State University, beter known as Wazzu) spent years at the top of the Princeton Review's list of Party schools, especially after the riot. But someone must think that things have calmed down because we don't even make that list anymore! Maybe it's because of the "dry" campus.. but I'm sure you all have that too...
