(Picking out a Tuxedo for Bart. He doesn't look pleased with his puffy shirt tuxedo.)
Bart: (frowning) Isn't this shirt kinda gay?
Clerk: Last time I checked, pirates weren't gay.
Homer: Eww, how'd you check?

Bart: I can't believe we have to start another year at school. I never learned anything at that suck shack.
Homer: Hey! Who taught you language like that?
Bart: Kid at school.
Homer: So you did learn something!

Lisa: I need some candy for our first playdate, but I don't want to come on too strong.
Bart: M&M's?
Lisa: Well, if I pick plain she'll think I'm cheap, and if I pick peanut, she may have an allergy. You just killed her, Bart!
Bart: How about Charleston Chew?
Lisa: What is this, Brooklyn in the fifties? Don't just say stuff.
Bart: You asked for my help, then you don't want it.
Apu: Excuse me, but why not consider an Almond Joy? It looks like you only brought something for yourself, but then you just happen to have two pieces.
Lisa: Finally, a real suggestion!
Bart: If she doesn't like coconut, you're screwed!

Lisa: You can't keep Juliet and me apart! I'll... I'll disobey!
Marge: I'm Bart Simpson's mother, do you think you've got any tricks I haven't seen. ((Leaves the room)
((Lisa climbs out the window and slides down the tree only to land in a laundry basket being held by Marge)
Marge: Bart Simpson: Age 3. (Both go back inside)
(Bart comes out of a hidden door in the tree dressed in black)
Bart Simpson: Age 10. Mhwahahahaha!

Marge: Okay, remember our deal: Everyone gets to return one Christmas present with no hurt feelings. (holds up calendar with "From Bart" sticker) I'm returning this kitten calendar.
Lisa: (holds up identical calendar) Um, I'm also returning this kitten calendar.
Homer: Kitten calendar.
(Maggie holds up kitten calendar)
Bart: Hey, those are 15-month calendars! That gives you three extra kittens.
(The family stares at him blankly. He takes back the calendars)
Bart: That's the last time I get you guys a Christmas present at the last minute. (looks at back of calendar) Man, those are ugly kittens.

I'm cuckoo for killing stuff!

Bart

A log cabin? What am I, Davy Crockett? Also, who's Davy Crockett?

(Marge and Homer are kissing in the back of the peddle car)
Bart: Knock it off back there!
Homer: But we're married!
Bart: Ok, but keep it PG.
Homer: How about R?
Bart: PG-13.
Homer: Woohoo! Adult situations!
(Marge and Homer continue kissing)

Homer: You just cost me $200,000!
Bart: I thought it was 50.
Homer: I was gonna bet it on the dogs!

(Bart marvels at the things in Simon's bedroom.)
Bart: Wow, cool poster of Joe Montana.
Joe Montana: (steps out of the wall) It's not a poster.
(Bart screams)
Joe Montana: I'm the real deal. Every day I stand here the family donates a million dollars to Notre Dame. Did you know the words "Notre Dame" are French, but the team is the Fighting Irish? That's the kind of thing I think about in here.
Bart: Back in the poster, gabby.
Joe Montana: Yes, sir.

Milhouse: Hey, Bart. I think I have a crush on your new sister.
Bart: You had a crush on my old sister.
Milhouse: Yeah, but that wasn't going to happen.

Oh my, God. Simon set me up. And all this time I thought he wanted the life of a stranger he met in the bathroom.

The Simpsons Quotes

Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Homer: D'oh!

Homer: Aw, twenty dollars? I wanted a peanut!
Homer's Brain: Twenty dollars can buy many peanuts.
Homer: Explain how!
Homer's Brain: Money can be exchanged for goods and services.