Best Simpson Episode!

I believe "Lisa the vegetarian" is the best:

Homer: Marge, since I'm not talking to Lisa, could you please ask her to pass me the syrrup.
Marge: Ahh. Please pass your father the syrrup Lisa
Lisa: Bart, tell dad I'll only pass the syrrup if it wont be used on any meat product.
Bart: You dunking your sausages in that syrrup, Homeboy?
Homer: Marge, tell Bart I just want to drink a nice glass of syrrup like I do every morning.
Marge: Tell him yourself, you're ignoring Lisa, not Bart.
Homer: Bart, thank your mother for pointing that out.
Marge: Homer, you're not, not talking to me, and secondly I heard what you said.
Homer: Lisa, tell your mother to get off my case!
Bart: Uh, dad, Lisa's the one you're not talking to.
Homer: Bart, go to your room!

^ Yep a classic, wearing his fatman's dress & hat

I also like one where Bart gets the Church organist to play I.Ron Butterfly's 'In the Garden of Eden' (which is really Iron Butterfly's In-A-Gadda-Da-Vida). The old dear on the organ launches into a 17 minute keyboard solo, Homer reminises in Church about making out to this song, and members of the congregation hold up their lighters....fabulous