My father used to know the real Jeffrey Dahmer...
They weren't that close, but they knew each other in elementary school. They were classmates until my father's family moved to Chicago. Dad always said that he was a real shy and quiet kid, and barely had any friends even when he was young.
Of course no one thought that he'd grow up to be one of the most notorious serial killers, so keep in mind guys, the quiet shy kid you once knew when you were small, could very well grow up to be a psychopath...