I don't see this game here already, so I think I will add it. It's your basic beat-the-previous-post game.
1 - No posting something that can't be beaten. It's no fun if you just post "God" or "Nuclear Bomb" every time.
2 - The post must beat the thing above it in a healthy and undeniable way (e.g. lawn mower beats plant) It doesn't even have to be related, as long as it could realistically beat it. (e.g. falling tree beats deer)
Example of game:
Man sticking fork in generator
etc., etc., etc....
I'll start the first item: