Footballers can sometimes get a bad rap for their behaviour on the field.
Diving, faking injuries and arguing with referees are, unfortunately, all part of the game. But there is an uglier side.
The modern game is less tolerant of players intent on bending the rules, and while referees now enforce the game with a more strict and literal use of the rules, that doesn't mean that some players don't try.
And when they can't let their aggression out on the field of play, some players deem it necessary to release their pent-up energy off the field.
Here is a look at 20 players who you wouldn't want to meet in a dark alley, let alone on a football pitch.