No Bannanas

Two guys go into a pub. There is a swing band playing the old song "Yes, we have no bananas". Guy 1: I love this song! Guy 2: Yes. I think it's written by Mozart. Guy 1: Of course it's not. They didn't make swing music in Mozart's time. Guy 2: Yes they did! Guy 1: You're stupid! They didn't even have bananas back then. Guy 2: I know, that's the name of the song!