Mickey Rourke cut off his finger, because he didn't want it anymore.
He said: "I cut my little finger off because I thought I didn't want it. I was angry about something so I decided I didn't need the end of the little finger on my left hand. I didn't cut it off completely - it was still hanging on a tendon - and an English friend, Gary, carefully carried the end of it as we went to hospital to try to rectify the situation. It took the surgeon eight hours to sew it back on. I still can't bend it properly."
I think the real story is that he fingered Parasite Hilton and couldn't take the burning, so he cut that shit off. That's the truth!
WTF?! I thought he was the best thing in Sin City (Clive Owen too) but I didn't know he's almost as crazy as Tom Cruise.