Like many sports, football has had its fair share of crazy players through the years.
The difference between the beautiful game and other sports, however, is that people from nearly every country on earth can converge in a few regions, where they are allowed to play with abandon on a football pitch.
That is a recipe for craziness, and every league has seen enigmas whose actions defy explanation and who seem to belong in therapy, rather than on a club team.
Out of those many insane current and former individuals, here are 15 who embody the term, for one reason or another, more than the rest.
And, as I'm sure I've left some good ones out, feel free to have a go at me in the comments.