I have many on my list but the ones that stick out are Nate Marquart brutally KOing Tyrone Woodley with a savage elbows/uppercut combo. Woodley almost died in there. The other is Wanderlei Silva knocking out Rampage Jackson with a knee to the skull in their 2nd fight (24:07). Rampage's lifeless corpse slumped on the ropes with blood pouring out his head was a sight that can't be forgotten. People new to the sport don't realize what a monster Wanderlei was in his prime, he was the only one to ever KO Rampage.
Chuck liddell was a knockout Artist personified! I remember when he went to Pride FC where he joined their grand prix tournament and fought a then 205 pound Alistair. Great fight! But his KO of Sobral with a perfectly placed leg kick was awesome. Rampage KO over Wanderlei at ufc 98 was brutal, and Hendos KO of BiSPIng at UFC 100!
The great Chris Weidman knocking out Pederson Silva, he proved that Brazilian had glass shins and a glass chin.
Rampage was JUST as juiced up as Wanderlei, remember NO drug testing for PED's in Pride FC, every fighter was on them, Rampage is no exception. You are kidding yourself if you think otherwise.
Makes all their feats that little less impressive to me tbh, in fact Roids are rife in every little MMA gym across the country. It made me smile that bit more when I used to rag drug cheats about my own size and bigger knowing I've never taken steroids in my life...