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While working as Krusty the Clown's personal assistant, Bart accidentally steals the limelight when he knocks over a set on live TV and says, "I didn't do it!", which makes Bart famous...until Bart gets sick of the celebrity and people get sick of his catchphrase.
Lisa: And now you can go back to just being you, instead of a one-dimensional character with a silly catch-phrase.
Homer: (Breaking a lamp) D'oh!
Bart: Ay, carumba!
Maggie: (Sucks her pacifier)
Ned Flanders: Hi-dilly-ho!
Nelson: Ha, ha!
Mr. Burns: Excellent!
(Long pause, everyone stares at Lisa)
Lisa: If anyone wants me, I'll be in my room.
Homer: What the hell type of catch phrase is that!?
Bart: Have any of the workers had their hands cut off by the machinery?
Factory Worker: No.
Bart: And then the hand started crawling around and tried to strangle everybody?
Factory Worker: No, that has never happened.
Bart: Any popped eyeballs?
Factory Worker: I'm not sure what kind of factory you're thinking of.
Lisa: I've got a weekend job helping the poor and I'm only eight.
Homer: That's not a job, it's a waste of time. What can poor people pay you? Nothing! What satisfaction you get from helping them? None! Who wants to help poor people anyway? Nobody!