Time to dust off this thread.
Grift of the Magi
Announcer: Funzo! Funzo! Funzo! If you don't have Funzo, you're nothin'!
Also:
Jim Hope: Do you have any idea how much pressure we're under to come up with a new Furby or Tickle Me Elmo? And thanks to you, Funzo is the first doll designed by children, for children, with all the profits going to children!
Lisa: Really?
Jim Hope: Yeah, well... we're all somebody's children!
Lisa's Sax
Dr. Pryor: The point I'm trying to make here is, that Bart must learn to be less of an individual, and more a faceless slug.
^ Great lesson for the kids out there.
The Principal and the Pauper
(Real) Skinner: Don't you have any dreams?
Armin: My dreams all involve combing my hair.
The Twisted World of Marge Simpson
Marge: ...and then they gave me back my $500 investment and kicked me out of the club.
Homer: Wait, wait, wait, wait, wait. Back up a bit now. When are the pancakes coming in the mail?
^ You boys are only interested in one thing.
The Mysterious Voyage of Homer
(Homer samples Ned's "five alarm" chili)
Homer: One, two... hey, what's the big idea?
Ned: Oh, I admit it. It's only two-alarm, two-and-a-half, tops. I just wanted to be a big man in front of the kids.
Todd: Daddy? Are you going to jail?
Ned: We'll see, son. We'll see.
^ Ned's goody-two shoes shtick is always good for a laugh.
A Milhouse Divided
Marge: Lisa, how was school?
Lisa: (distracted by the TV) How was what?
Marge: School! School!
Lisa: It's not time for school.
Marge: I KNOW it's not time for- (groans)
Miracle on Evergreen Terrace
Kent Brockman: So while you're home today, eating your sweet sweet holiday turkey, I hope you'll all choke, just a little bit.
^ A news reporter just wished bad things on the very people who watch him. Why is he still employed again?
The Cartridge Family
(after Homer recklessly uses his gun)
Krusty: Hey, yutz! Guns aren't toys. They're for family protection, hunting dangerous or delicious animals, and keeping the King of England out of your face.
^ Great callback to a previous joke.
Bart Carny
(Bart is in overalls, prepared to do backyard chores)
Bart: I can't go out dressed like this; what if someone sees me?!
Marge: You're just going into our backyard; no one will see you.
(Bart opens the door)
Nelson: Haw-
(Bart shuts the door; Marge opens it again)
Nelson: ...Haw!
The timing on Nelson's haw-haw is just about perfect.
Grift of the Magi
Announcer: Funzo! Funzo! Funzo! If you don't have Funzo, you're nothin'!
Also:
Jim Hope: Do you have any idea how much pressure we're under to come up with a new Furby or Tickle Me Elmo? And thanks to you, Funzo is the first doll designed by children, for children, with all the profits going to children!
Lisa: Really?
Jim Hope: Yeah, well... we're all somebody's children!
Lisa's Sax
Dr. Pryor: The point I'm trying to make here is, that Bart must learn to be less of an individual, and more a faceless slug.
^ Great lesson for the kids out there.
The Principal and the Pauper
(Real) Skinner: Don't you have any dreams?
Armin: My dreams all involve combing my hair.
The Twisted World of Marge Simpson
Marge: ...and then they gave me back my $500 investment and kicked me out of the club.
Homer: Wait, wait, wait, wait, wait. Back up a bit now. When are the pancakes coming in the mail?
^ You boys are only interested in one thing.
The Mysterious Voyage of Homer
(Homer samples Ned's "five alarm" chili)
Homer: One, two... hey, what's the big idea?
Ned: Oh, I admit it. It's only two-alarm, two-and-a-half, tops. I just wanted to be a big man in front of the kids.
Todd: Daddy? Are you going to jail?
Ned: We'll see, son. We'll see.
^ Ned's goody-two shoes shtick is always good for a laugh.
A Milhouse Divided
Marge: Lisa, how was school?
Lisa: (distracted by the TV) How was what?
Marge: School! School!
Lisa: It's not time for school.
Marge: I KNOW it's not time for- (groans)
Miracle on Evergreen Terrace
Kent Brockman: So while you're home today, eating your sweet sweet holiday turkey, I hope you'll all choke, just a little bit.
^ A news reporter just wished bad things on the very people who watch him. Why is he still employed again?

The Cartridge Family
(after Homer recklessly uses his gun)
Krusty: Hey, yutz! Guns aren't toys. They're for family protection, hunting dangerous or delicious animals, and keeping the King of England out of your face.
^ Great callback to a previous joke.
Bart Carny
(Bart is in overalls, prepared to do backyard chores)
Bart: I can't go out dressed like this; what if someone sees me?!
Marge: You're just going into our backyard; no one will see you.
(Bart opens the door)
Nelson: Haw-
(Bart shuts the door; Marge opens it again)
Nelson: ...Haw!
The timing on Nelson's haw-haw is just about perfect.