You're about fight somebody and they say a random thing like "i know how to box" or "i know mma"

Most people aren't going to tell you and if they do I would not pay attention to their words I would pay attention to their stance their posture and the way they approach the situation. Just like a man holding a knife if he holds it one way you know he has no idea what he's doing and he's not a real threat, if he holds it another then that suggests he is a professional and he has been there before

Nah. Ɓy the time they said it I'd be on my knees begging for mercy.

LOL, you are either going to fight or talk about it.....talk is cheap. It doesn't matter one way or the other.

People that know, just restrain you so they don't kill you. If it ever got to that point