GSP repeatedly clocking Jay Heiron, Joe Rogan repeatedly claiming Heiron "is out!!!", and Heiron repeatedly being snapped back into consciousness only to get momentarily knocked out again. Heiron was punch drunk that whole fight.
Arlovski knocking out Buentello was funny, too. Buentello was out, the ref got him back up, and he tried to play like he was fine, putting his hands up and nearly falling over backwards while doing so.