You should never kick a man while he's down, especially not in his, uhhhh, exit hole.
An MMA fighter was recently docked a point by the referee for kicking his opponent where the sun doesn't shine. The maneuver brings back memories of infamous rugby league John Hopoate, who once stuck a finger up the backside of three players in the same game.
While MMA can get pretty bloody rough, there are still a couple of rules and one of them is that you can't just stick your toe up your opponent's behind when they're on the ground.
Check the clip out below to see where it all went wrong for British fighter Alfie Davis when his opponent Jorge Kanella decided to cary out an impromptu 'oil check'.