The inevitable heat death of the universe. Energy-transfer is not 100%-efficient. The tiniest fraction of energy is lost during the transfer. This is not significant enough to have any effect during the transfer, but it all adds up. Eventually, absolutely everything as you know it will simply run out of energy. Even the humble atom will throw its hands up in the air and say, "you know what? Fuck this. I'm just not working for you niggers, anymore." Thankfully this is nearly countless years away, so don't worry. You just won't live that long.

Also, Patty is a vain cunt, but I'd still fuck her.