two fraternities in particular have a very harsh rivalry going on- i really hate it b/c its hard to hang out with one crowd- or the other- and my best friend and big bro is in one- but our brother fraternity is the other- it sucks...
there have been major fights- house damage etc
two different fraternities were also involved in a major incident a few years ago- i think when i was a freshman- one brother was at a party at the others house- and he "fell" off a balcony and was beaten to death.... there are a lot of implications- but no real ideas as to what happened.... its really sad
our greek community is pretty small- so rivalries between fraternities AND sororities are very common