Lisa: Mom! Dad built a device that would be deadly in the wrong hands! And he's holding it!
[the old folks have a dog for about a day]
Grampa: That's too bad. We've had that dog for as long as I can remember.
Other old guy: Who the hell are you?
Grampa: I wish I knew!
Homer: I've gone back in time to when dinosaurs weren't just confined to zoos!
Homer: What the hell are we going to do with ten thousand angel ashtrays?
Bart: I could take up smoking.
Homer: You damn well better!
Homer: Hey, who are you?
Ghost: The ghost of Cesar Chavez.
Homer: Why do you look like Cesar Romero?
Ghost: 'Cause you don't know what Cesar Chavez looks like.
Bart: Hootie and the Blowfish?
Chief Wiggum: Hey, it was cheaper than a blank tape.
[Smithers turns on his computer]
Picture of Mr Burns: Hello, Smithers. You're quite good and turning me on.
Smithers: Uhh ... you probably should ignore that.
Ned Flanders: My neighbour Homer released a radioactive ape into my house. It's, uh, taken over the top floor.
Bart: It wasn't dad's fault. The ape tricked him!
Homer [in confession]: I wiped a booger on your shirt, I made a dog and a cat kiss, I swiped a bolted-down TV from a Holiday Inn, I coveted the wife in Jaws 2, I lied to a waiter, I masturbated eight billion times and I have no plans to stop masturbating in the future. Woohoo, I'm clean! In your face, Lord!