$pringfield (or How I Learned to Stop Worrying and Love Legalized Gambling) - S5-E10
Bum: Got any spare change, man?
Grampa: Yes! And you ain't gettin' it! Everybody wants something for nothing. [He walks into the Social Security Office.] I'm old! Gimme gimme gimme!
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.