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.