Okay, actually Cracked.com calls them "Oh, Shit!" moments, but some of my readers have delicate sensibilities and I didn't want to foist the word "shit" upon them. That's me: I'm a giver.
Anyway, some of the best "Oh, Shit!" moments in MMA, according to Cracked.com. Gotta say, the fights listed here that I've seen are deserving of being on the list (I can't watch them all before linking to them because I don't have the pipes for it here). My two personal favorites: Bob Sapp vs. Nogueira and, of course, the Frye/Takayama pummel-thon.
H/T AoS news sidebar