Using things that seem normal in the game like the coins floating can give may provide with good jokes next to a serious story. Here's an example:

Jazz and Spaz walking through a cave...
Spaz: Oh look a coin
Jazz: Wait! Don't pick it up.
Spaz: Why?
Jazz: Don't you think a floating coin is somewhat suspicious?
Spaz: It's just a coin. What's the worst that can happen?
Spaz picks up the coin and the cave starts crumbling.
Spaz: Eh hehe.

I really wanna hear people's ideas about this whole case, so put your thinking caps on and let's start the race!