Referee head-butts player; player goes down

http://youtu.be/oc6ZnQds0zI

This clip features a referee running into Palmeiras midfielder Jorge Valdivia and unknowingly head-butting him during the ‘Derby Paulista’ against Corinthians. Apparently, the head-butt was harder than it was anticipated as the player was left flat out on the pitch.

Zinedine Zidane has a new competition guys!