First rule of fight club, don't suck at fighting.
Dude takes a kick to the face and takes a nap!
A bad landing knocks this guy out cold. He's going to wake up with a headache!
More drunk people knocking each other out by having a slap contest. Rule of thumb, don't play with the guy that is twice your size.
A couple of kids go at it in the locker room with some boxing gloves and one of them gets knocked out cold.
A fellow soldier shows his buddy how to knock someone out using a karate chop.
He almost landed the jump with his bmx bike but came up short and knocked himself out cold.
You're supposed to catch the ball with your glove not your forehead.
The bigger kid punches like a girl. The smaller kid knocks out his buddy...lol