Gorillas have a good sense of humor

But do they have theory of mind? U.K. researches say yes.

Here's the best part:

The typical gorilla sense of humour, [zoo keeper Iona] Stewart says, is Schadenfreude. One gorilla she knew would poke a stick at strangers then look the other way. "If they could whistle, they'd be whistling, but they're not quite clever enough to get away with it."