Jason: Are you going to the baseball game with me this afternoon?
Emily: No. It’s a waste of time. I can tell you the score before the game starts.
Jason: Oh yeah? What is it then?
Emily: Nothing to nothing!
Another variation of this joke:
First Fan: I can tell you what the score’s going to be before this game starts.
Second Fan: Really, what is it?
First Fan: Nothing to nothing.