Kinda shocked that people are talking old fights and size disadvantages yet no mention of Royce Gracie. He was, for me at least, the reason I got into MMA (particularly BJJ). Here's this normal looking 185 pound man (natural WW) fighting HW's and dominating. I thought Kimo was going to kill him, same with Shamrock and Severn.
"Let them see that their words can cut you, and you'll never be free of the mockery. If they want to give you a name, take it, make it your own. Then they can't hurt you with it anymore." - Tyrion Lannister