I've been hit a couple of times and both of them i was drunk. The first time, to cut a long story short, i let the guy hit me. He was pissed at a group of us for stealing stuff from his house and he said somethin like "give me one reason, why i shouldn't hit you"...so i just said "Just hit me man, make yaself feel better"...(he didn't expect me to say that!) Basically i stood there with my chin in the air and he whacked me. It dropped me to the ground but i got straight back up and me and my mates got a cab home. Yeah i know, i'm fuckn TUF.
The second time, i was in a little altercation with a guy at a club then his mate tried to talk to me and i couldn't hear a word he was saying (because of the music) and i kept trying to motion to him that i couldn't hear, but he didn't get what i was trying to say. After he tried to talk to me i just left and started dancing again...Then, later on, we were on our way to the train station (this was like at 6 in the morning) to go home and all of a sudden he comes up behind me and starts screaming in my face. Instead of returning the anger back on him i was more like "night's over mate, just go home"...This actually made him angrier lol and in turn pissed me off as well so i started getting in his face then WHACK! i just got blindsided by one of his friends - it staggered me a little bit but i kept arguing with the guy as if nothing happend, which discouraged him (and his group) a bit...A few seconds later a security guard came and told us all to leave.
I can say that both times, getting punched in the face didn't hurt at all, it just stuns you.