Kotaku - Sure, shooting people is an option in Black Ops II, and that's plenty of fun. Or, you can play catch with your enemies. With a live grenade. Don't worry, it won't go off. Here's how.
The folks over at defendthehouse found that, if two people have the "fast hands" perk—which allows you to throw back grenades—they can just keep throwing a live grenade back and forth forever. Kind of absurd, eh?