Getting raped in jail by a huge black man named Kimbo Slice as a result of getting imprisoned by unlawfully using guns instead of learning martial arts > katana + gun (these can't be smuggled into your cell!)
Keyser Soze > any sort of criminal intent, no matter how minor
And like that, he's gone. Underground. Nobody's ever seen him since. He becomes a myth, a spook story that criminals tell their kids at night. "Rat on your pop and Keyser Soze will get you." But no one ever really believes.