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