To blatently violate the rules of MMA(UFC specifically) by hitting your oponent LONG after the bell signaled the end of the round.
Come on man. Andy Whynaught's "at-the-buzzer" hit, during the Respect in the Cage at Fox Theater in Pomona, CA on 7/30/11, was NOTHING like when Koscheck got Daley'd during his fight at UFC 113.
To duck a fight against an apponent you're sure you'll lose to if you have to face.
GSP totally Tito'd out on fighting against Anderson Silva.