A game like Never Have I Ever - but people have to guess if you're lying or not...
You'll get a prompt with a statement like "I have done (insert terrible thing)" If you haven't done it, you have to make up a convincing story about it. If you have, you tell the story - but make it so unbelievable that they think its a lie. The group listens, debates, and makes their guess. If they call it right, you take a penalty. If they're wrong, they take a penalty.