It's a serrated blade attachment from my Cuisanart food processor. It's the single most destructive and dangerous kitchen implement in our house, responsible for more pain and bloodshed than everything else combined. I can't use the thing without it leaping up at me or falling down on me or sidling over towards me to attack. Slicing, poking, impaling, sawing, you name it, this hideous monstrosity has done it.
Evil? Oh yes. It's evil.