Personally, I've had that Gator chomp thing, and the FSU tomahawk chop up to here. (I'm pointing at my neck). Not to mention that incessant chant that goes with the tomahawk.
+1. I can't stand that Gay-tor chop thing either. Very obnoxious.
Also, what about Texas? That "hook-em horns" thing is getting a little tiresome. Plus, I think having Matthew McConaughey as your unofficial team mascot jumping up and down like a little girl on the sidelines at of all of their big games is a prime example of obnoxious fan behavior.