The 'everyday sadist' could be living next door
You don't have to go to the movies to see someone exhibit extreme criminal behaviour or sexual torture - they may be sitting next to you

Try this quick word association: Sadist.
And you respond ... Hannibal Lecter? The Marquis de Sade?
Actually, you didn't need to come up with representatives of extreme criminal behaviour or sexual torture. You might just as well have considered the colleague two cubicles over. The one who spends his lunch hour splattering the brains of videogame characters.
Those who enjoy inflicting at least moderate pain on others, directly or vicariously, mingle with us daily. Think mean girls, taunting a classmate to commit suicide. Or the professor who grills a squirming, clueless student, lips curled in a small, savage smile.

"They exist on a spectrum," he said. "It could be at a hockey game and your guy is pummelling the opponent into hamburger and people are standing up having orgasms, to taking revenge on those you think deserve it, to schadenfreude."