This is a simple game I think I thought up, I can't be sure it's original.
Example:
Starter of the game: People who fall down always get up!
Person 2: Unless they're dead.
Person 3: Unless Mercy is around!
Let's continue from the last part of the example. Just list any situation that could stop the situation above from happening.
When you get stuck, post a different fact so others can figure out something that would prevent it!