Looking closer to home...
Shandy Van Der Meyde. It's hard to disentangle madness and stupidity with him, but he was usually involved in some silly antics somehow.
Steven Pienaar. I actually think our little South African cuts a bonkers figure. Firts his insanely deep voice for his stature marks him out. The there is the 'god is great' proclomations set against very unchristian behaviour such as drink driving, getting involved in police investigations for assaults on women, speeding fines, and greed (the move to spurs for money). Add to that his apparent dreamer / delusory qualities. By this, I mean some of his waffle before the world cup about emulating the film Invictus. Yep, he's a bit off the wall if you ask me.
Royston Drenthe. Coming across like a cross between 50 cent and a pit bull, the boy is never far away from trouble. Clearly unhinged.