Skinner's Sense of Snow - S12-E8
Nelson: Hey, look how much Skinner makes: $25,000 a year.
Bart: Let's see, he's 40 years old times 25 grand. Whoa, he's a millionaire.
Skinner: I wasn't a principal when I was one.
Nelson: Plus, in the summer, he paints houses.
Milhouse: He's a billionaire.
Skinner: If I were a billionaire, why would I be living with my mother? [All the kids laugh at him.] They're just not responding to logic anymore.
Agnes Skinner: Start over. I want everything in one bag.
Squeaky-voiced Teen: Yes ma'am.
Agnes Skinner: But I don't want the bag to be heavy.
Squeaky-voiced Teen: I don't think that's possible.
Agnes Skinner: What are you, the possible police? Just do it.
Tree House of Horror XI - S12-E1
Homer: Did you see that? I did the deed. Open up.
St. Peter: Oh, I'm sorry. I wasn't looking.
Homer: Hey, I thought you guys could see everything.
St. Peter: No, you're thinking of Santa Claus.
Homer: Well I'll be damned.
St. Peter: I'm afraid so, yes. [Drops Homer into Hell.]
The Computer Wore Menace Shoes - S12-E6
Agnes: Seymour, are you looking at naked ladies?
Principal Skinner: No, mother.
Agnes: You sissy.
Edna: Let's do it on Martin's desk!
Skinner: It is usually the cleanest.
Kent Brockman: That's game, set and match to us. But the real winners here are Marge's hors d'oeuvres.
Homer: Wow, how do you come up with such witty remarks?
Kent Brockman: Ha ha, well...
[Two men are suddenly shown in a news van giving Kent typed responses through an earpiece.]
Tech Guy #1: [to his coworker, who is typing out a response] Come on, come on. Hurry up. [The coworker hands him the response] "I guess you could say it's my racket."
Kent Brockman: I guess you could say I'm Iraqi.
Homer: [Gasps] Get off my property.
Homer: I won't lie to you. Fatherhood is not easy - like motherhood.
Day of the Jackanapes - S12-E13
Sideshow Bob: Urgh. Rakes, my arch-enemy.
Bart: I thought I was your arch-enemy.
Sideshow Bob: I have a life outside of you, Bart.
Answer: I'm not sure if this is the one you're thinking of, but an episode of "Ray Bradbury Theatre," called "A Sound of Thunder," dealt with a similar matter: a group of hunters travel back in time to hunt dinosaurs, only to find things have changed when they get back because someone stepped on a butterfly.
Xofer