The ones you least think so are the ones with scary degrees of ability. I had a roomie once and unbeknownst to his mates he taught, at 19, the police in contact point kung-fu and literally had a get out of jail free card. If he was picked up say in a fight, the card from the police identifying him as an instructor who wouldn't use excessive force and not to detain him. He could knock me down with his thumb.