Ryan Hall, a BJJ black belt and ADCC medalist, got attacked at a restaurant recently. Now this seems legit, but it's hard to be 100% sure.

Taking it as this was a serious situation, I think he did well on the first occassion, but the second time I personally would've waited for the police rather than take the guy on again.

For those of you who don't like cussing be forwarned, there's a bit going on in this clip:

"Let your food be your medicine, and your medicine be your food" Hippocrates.