Ok, this got longer than I expected.
From the Stampy the Elephant episode I believe after hitting a deer:
Homer: DOH!
Marge: A deer.
Lisa: A female deer.
----
Chief Wiggum: No, this is uh... 9-1-2.
----
After a whistle blows, Homer slides down the power plant into his car and sings to the tune of The Flintstones:
Homer: Simpson, Homer Simpson. He's the greatest guy in history! From the town of Springfield, he's about to hit a chestnut tree. AAH!
----
Billy Corgan: Billy Corgan, Smashing Pumpkins.
Homer: Homer Simpson, smiling politely.
----
Lou: I went to the McDonalds over in Shelbyville the other day.
Chief Wiggum: The Mc-what?
Lou: Yeah, I never heard of it either but they say they have over 2000 locations in this state alone.
Eddie: Hmm...Must've sprung up over night.
Lou: But you know, its the little differences.
Chief Wiggum: Example?
Lou: Well at a McDonalds you can get a Krusty Burger with cheese. But they don't call it a Krusty Burger with cheese.
Chief Wiggum: Get out! What do they call it?
Lou: A quarter pounder with cheese.
Chief Wiggum: Quarter pounder with cheese...well I can see the cheese but? Hey, do they have Krusty's Partially Gelatinated Gum-Based beverages?
Lou: Yeah, they call them 'shakes.'
Eddie: *Pfft* 'Shakes.' You don't know what you're gettin'.
----
Homer: Weaseling out of things is important to learn. It's what separates us from the animals... except the weasel.
----
Marge: Homer, the plant called. They said if you don't show up tomorrow don't bother showing up on Monday.
Homer: Woo-hoo! Four-day weekend!
----
Alien: I bring you love!
Larry: It's bringing love, don't let it get away!
Carl: Break its legs!
----
Homer: Maybe, just once, someone will call me "sir" without adding, "you're making a scene."
----
Homer: Kids, just because I don't care doesn't mean I'm not listening.
----
Kent Brockman: At 3pm Friday, local autocrat C. Montgomery Burns was shot following a tense confrontation at Town Hall. Burns was rushed to a nearby hospital where he was pronounced dead. He was then transferred to a better hospital where doctors upgraded his condition to alive.
----
Redneck: Let's fight!
Other Redneck: Them's fightin' words!