Sweet Seymour Skinner's Baadasssss Song - S5-E19
Principal Skinner: I finally have time to do what I've always wanted: write the great American novel. Mine is about a futuristic amusement park where dinosaurs are brought to life through advanced cloning techniques. I call it "Billy and the Cloneasaurus."
Apu: Oh, you have got to be kidding, sir. First you think of an idea that has already been done, and then you give it a title that nobody could possibly like. Didn't you think this through? [The scene jumps forward in time.] It was on the best-seller list for 18 months. Every magazine cover had it... [The scene jumps forward in time again.]...one of the most popular movies of all time, sir. What were you thinking? I mean thank you, come again.
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.