WAR Frank Mir!
No time to tap. I love his explosive style of BJJ. In training you're taught to let the other guy tap, but a real fight is different. See here for some technical post-fight comments from Frank. (More MMA and BJJ theory at 2:45 here.)
The fundamental asymmetry of MMA
"F@ck jiujitsu -- I'm gonna break your nose."
"Maybe, but if I get my hands on you there's no tapping. I'm tearing your arm off."
In MMA, it's unfair that the striker gets to hit the other guy at full power, but the grappler has to release the hold when the other guy taps. If there was no referee the striker would think very, very hard before mixing it up. [Some guy tries to break my nose or fracture my skull, and I'm supposed to let him tap?!?]
When I was faculty advisor for the Yale jiujitsu club we considered t-shirts with "Snap, Crackle, Pop" on them, but went with something more conservative like "Yale Brazilian Jiujitsu" :-)
Video of Mir's submission. Nogueira is a top grappler and the last 50 seconds shows some very technical BJJ. Mir escapes a guillotine, gets the kimura, and prevents Nog from escaping a couple of times. Reminds me of what Sakuraba did to Renzo, or Kimura to Helio! On closer review, Nog did have plenty of time to tap, but refused to do so -- just like Helio. Another video.