I have been knocked out twice in my life
1. Was on the farm when a 15 foot steel gate got caught on the tractor, bowed back, flew back, hit a compost wall then came swinging back nailing me from behind.
I don't even remember it. I remember waking up about 20 feet from where I was having my dad laughing hysterically while saying "Are you alright?".
2. I was drunk and hit some dude over the head with a beer bottle. (didnt break). Me and my buddy got thrown out the front doors and the other two guys got thrown out the back doors.
Well they came around and was coming at us, which I was standing ready to whoop some ass. This gigantic roided bouncer came running up behind me and plowed his shoulder into my back knocking me forcefully to the asphalt breaking out 5 of my teeth, lacerations, and unconscious. I woke up for a short time, passed out, then rewoke in the hospital.
Neither of those were fun.