and maggie makes three is my personal favorite.
Is that the one where Homer tapes the pictures over the sign at the end to say "Do it for her"? That episode has always stuck with me. I really like the Stonecutters episode too. I don't pay attention to the episode names sadly, but anyway.
Marge: I don't want you stalking people tonight.
Homer: All right, fine. I'll be right back. I'm just going outside... to... stalk... Lenny and Carl... D'oh!
and
Homer: I swear, that if I ever reveal the secrets of the Stonecutters, that my stomach shall become bloated, and my head plucked of all but three hairs...
Moe: Um, I think he should have to take a different oath.
Number One: Everybody takes the same oath!
*Edit - Just had a look, it's Homer the Great. One more quote because it's awesome. lol.
Homer: I'd give anything to get into the Stonecutters.
Lisa: What do they do there, Dad?
Grandpa: I'm a member -
Homer: What do they do? What *don't* they do?
[laughs]
Homer: Oh, they do so many things they never stop. Oh, the things they do there, my stars.
Lisa: You don't know what they do there, do you?
Homer: Not as such, no.