Lisa: I'm not a state, I'm a monster!
*starts crying*
Homer: No, Lisa. The only monster here is the gambling monster that has enslaved your mother. I call him Gamblor, and we must save her from his neon claws!
Bart: Oh, me and Santa's Little Helper used to be best friends before his b!tch moved in.
Marge: Bart!
Bart: But that's what it means! I looked it up in the dictionary.
Marge: Well, I'm going to write to that dictionary. Sounds like a mistake to me.
Drunk Mr. Rogers: What do you mean I can't take off my sweater? I'm HOT!!!
Hank Scorpio: Homer, what's your least-favorite country? Italy or France?
Homer: France.
Hank Scorpio: Heh! Nobody ever says Italy.
Troy McLure: *Singing* I hate every ape I see
From chimpan-A to chimpan-Z
No, you'll never make a monkey out of me
Oh my God, I was wrong
It was Earth all along
You've finally made a monkey
Apes: Yes, we've finally made a monkey
Troy: Yes, you've finally made a monkey out of me
Apes: Yes, we've finally made a monkey out of you
Troy: I love you, Dr. Zaius!
Yes, the Planet of the Apes musical has to be one of the most classic Simpsons moments ever.