Headbutting glass is probably not the smartest thing to let your goat do.
A frustrated basketball player headbutts the hoop and paralyzes himself.
Tough guy gets knocked da F*** out by a smaller kid. Now that's what I call using your head!
You can almost hear his skull crack on this headbutt.
Brittany Furlan gives head for the first time.
This was the headbutt heard around the world. The world cup to be exact.