Props on admitting you were wrong Garth, it takes a big man, I try to do it as much as possible, although you DID TOTALLY "sleep on Cain" lol.
No offense, but that would be an understatement, in regards to this fight you were in a freakin coma against Cain hahah.
Man, this would be a very hard one for me, I think there could be any number of answers.
But the one that immediately comes to mind with the least amount of thought, is, believe it or not, Royce vs Sakuraba 1.
You know, I have been a fan since UFC 1 in 1993, I first got on a BJJ mat in 1995 and had seminars with Royce throughout the 90s and he actually knew who I was for a while (I doubt he still remembers me) and I have been training on and off since 1996 (A LOT of off due to injuries and many other reasons).
But back then, I (and many others) thought Royce was invincible.
I had gone through my period of doubting him, UFCs 1-4, and didn't accept he was the man until UFC 5 when he fought Shamrock to a draw.
After that, I thought he couldn't lose, that BJJ was the only art ANYONE EVER needed to know (I have since learned otherwise).
I didn't see the fight till I knew the result.
But I went to my BJJ class back whatever year that was, and asked my friends the result, and I was in SHOCK to hear that Sakuraba had not only beaten Royce, but had actually come close to subbing him with both a kneelock and standing armlock.
There hadn't even been a question in my mind that he might lose.
That took some getting used to and was my wake up call that there is more to MMA than just BJJ.