(Homer is sleeping at the power plant with the radio on)
Radio Announcer: FDR is in the White House. An ice cream cone costs a nickel, and a hot new tune by Benny Goodman is hitting the charts. The year is 1939.
Homer: Nineteen … 1939! Oh, my God, I've gone back in time! I've got to warn everybody about Hitler …and get to the ice cream store!
Lenny: Hey, Homer, what's all the hubbub?
Carl: Let me guess. You travel back in time again?
Homer: Shut up. You haven't even been born yet.