I did this to an asshole coworker, that tried to physically intimidate me several times, once. Told him I was going to dress up as a clown and chop up his whole family with a rusty butter knife and feed them to a pig farm nearby.
No one believed him, not even management. He was known to be an idiot anyway, so he was let go that day. He totally deserved it for threatening me first. Its not my fault I'm better at it then he is.