I've seen it every single time some big "swole" dude comes to my Muay Thai gym.
The dude gets knocked out during his first sparring session and never returns.
I'm sure you're a bad mofo though, you must be.

I'm not a big swole dude but I'm am 250lbs at just under 5'10, I'm am a former athlete. I've been in some scuffles and won them all. BUT I don't think I'm bad or awesome or anything. I do know that a 155lb guy UFC, Muay Thai or whateverthefuck isn't whoppin' my ass, you might as well lose to a female...

I'm not talking putting the gloves on and going at it. I'm talking street fight anything goes. The brother just go caught no big deal...Although I;m not sure what happened cause the cameraman.
I don't claim much on this site but I'll claim that.