3 of the best:
"Listen to me, you; when I catch you, I'm gonna pull out your eyes and stick 'em down your pants, so you can watch me kick the crap outta you, okay? Then I'm gonna use your tongue to paint my boat! "
Moe: Plastic surgery, huh? Eh, maybe they could dynamite Mount Crapmore here and carve me a new kisser.
Carl: Oh, I don't know. Plastic surgery might make you look good on the outside, but you still might feel bad in the inside.
Moe: But I'd look good on the outside, right?
Carl: Yeah, but you'd feel bad inside.
Moe: Plastic surgery it is!
Homer Simpson: You used to be a boxer just like me?
Moe Szyslak: Yup. They called me Kid Gorgeous. Later on, it was Kid Presentable. Then Kid Gruesome. And finally, Kid Moe.
Moe Szyslak: Are you man enough to test every one of your limits?
Homer Simpson: Yes!
Moe Szyslak: And are you man enough to throw a punch should the opportunity arise?
Homer Simpson: Yes!
Moe Szyslak: And are you man enough to give me a sixty percent cut?
Homer Simpson: Yes!
Moe Szyslak: I'll take it.
Homer Simpson: Whoo-hoo!