Homer: Well, time to go to work.
Homer's brain: Little do they know I'm ducking out early to take the
Duff Brewery tour.
Homer: Roll in at nine, punch out at five, that's the plan.
Homer's brain: Heh, heh, heh. They don't suspect a thing.
[camera pans down to Homer's mouth, but he doesn't say
Well, off to the plant.
Homer: Then to the Duff Brewery.
Homer's brain: Uh, oh. Did I say that or just think it?
Homer: [panicky] I've got to think of a lie fast!
Marge: Homer, are you going to the Duff Brewery?
Homer: Aah! [Runs off]
-- Brain before mouth?, "Duffless"