Lines/Jokes/Gags that still crack you up?

[Monty Burns]

Mr Burns: Smithers I'm home!
(Audience laughs, Smithers pokes head through and walks on)
Smithers: What already?
(Audience laughs)
Mr Burns: Yes.
(Audience laughs)
Lisa: Is it my imagination or is TV getting worse?
Homer: It's about the same. Uh oh, look out Smithers!
(Audience laughs)
Homer: hehe. I love this show.

Ev-er-y-one-is-talk-ing-a-bout-Ray-dio-ac-tive-ma-an-y'all!

All of Last Exit to Springfield.

[Handsome B. Wonderful]

Wait--there's a lemon behind that yellow rock!

[iambobdole1]

It's RadioACTIVE man, jerk!
Funny, I shouldn't have been able to hear that...

[Cam23]

I like the way Lisa seems to have an encyclopedic knowledge of American history,and casually namedrops obscure female American poets,ecologists,pioneers,feminists etc into everyday conversations.

[Insecthero]

"Bart, Nelson hit me!"

"He sure did."

Troy McClure eyeing the camera when he first kissed Selma on the cheek.

[Alcatraaz]

Grampa: We can't bust heads like we used to, but we have our ways. One trick is to tell 'em stories that don't go anywhere - like the time I caught the ferry over to Shelbyville. I needed a new heel for my shoe, so, I decided to go to Morganville, which is what they called Shelbyville in those days. So I tied an onion to my belt, which was the style at the time. Now, to take the ferry cost a nickel, and in those days, nickels had pictures of bumblebees on 'em. Give me five bees for a quarter, you'd say.

Now where were we? Oh yeah: the important thing was I had an onion on my belt, which was the style at the time. They didn't have white onions because of the war. The only thing you could get was those big yellow ones...

=Last Exit to Springfield, 9F15.

[Christopher the Chef]

I am the Angel of Death. The Time of Purification is at hand.

[Company Picnic]

Manic-Depressive Mouse, or the Bluebird of Unhappiness?

[Swoony]

[while Milhouse is strangling Bart, Bart gropes around for a weapon, and breaks the magic eight-ball over Milhouse's head]

Bart: Boy, I bet the eight ball didn't see that one coming.

[iambobdole1]

Milhouse: ants are crawling in my mouth, and I don't care.

[Handsome B. Wonderful]

That's right, Troy's back from the gutter and he's brought someone with 'im!

[rkell48]

Bart: L-----isa!
Homer: M----arge!

Bruno: 900 dollary doo's!

All of the Australian stereotypes running after Homer and Bart (Aboriginal, person from Mad Max etc)

---Bart vs Australia (mainly because I am Australian and I loved that episode)---

John: Except they call him "annual gift man" and he lives on the moon

---Homers Phobia---

[the_creeper]

In line at the airport
Guy at the counter-Next
Homer-Finally the only thing I wait in lines this long for are slightly better cellphones

[Christopher the Chef]

[ANdre1001]

^ I used to laugh like stupid to that joke XD

[rkell48]

Ralph: what's for lunch tomorrow?

Producer: Next!

Ralph: Chicken necks?

Season 7, Radioactive Man (early Ralph was good, current Ralph is fucking annoying)

[Christopher the Chef]

Alright, you win for now, but some day you'll rust! Rust, I tell ya!

[Burn_That_Seat]

Kent: Homer, organised labor has been called a lumbering dinosaur.
Homer: AAAAHH!
Kent: Um, my director is asking me not to talk to you anymore.
Homer: WOOHOO!

And

Homer: Ssh Lisa! The dog is barking!

[cloneasaurus]

"It smells funny in there"

"no it doesn't"

Homer's cheery rebuttal gets me every time. Brilliant execution.

[lmddawson]

"Hey.. that's not the wallet inspector."

[lmddawson]

"It smells funny in there"

"no it doesn't"

Homer's cheery rebuttal gets me every time. Brilliant execution.

Agreed. One of the best gags in Simpsons history. So simple but so effective.

[Toomanygrandmas]

[The Wiggs]

Chalmers: Aurora Borealis? At this time of year? At this time of day? In this part of the country? Localized entirely within your kitchen?
Skinner: Yes.
Chalmers: May I see it?
Skinner: Oh, um...No.

[L. Hutz]

Moe: Hey Homer way to get Marge pregnant.
Homer: This is getting very abstract... But thank you. I do enjoy working at the bowling alley.

[Prune Tracy]

Pretty much everything from Selma's Choice.

[cloneasaurus]

Why, there are no children here at the four-H club, either! Am I so out of touch...?

....No, it's the children who are wrong.

[The Thompsons]

[The Thompsons]

[Prune Tracy]

Oh my God, I almost fell out of my chair.

[The Thompsons]

One more for you Riviera: