theres better ones i'm sure but this one comes to mind...
from "A Tale of Two Springfields"...from the "phoney McRingring" film
Phoney: "Scientists say even a monkey can remember 10 numbers. You're not stupider than a monkey are you?"
Chief Wiggum: "Well, how big of a monkey?"
Phoney: "Of course you're not!" 
edit, this one's good too...
a news story reported by kent brockman...
brockman: "The world's first two story outhouse."
*two guys go in the outhouses*...
 "Oh, God, stop!"
and more classic quotes from brockman...
Kent Brockman "Professor, without knowing precisely what the danger is, would you say it's time for our viewers to crack each other's heads open and feast on the goo inside?" Professor "Yes I would, Kent."
"Ladies and gentlemen, uh, we've just lost the picture, but what we've seen speaks for itself. The Corvair spacecraft has apparently been taken over- 'conquered' if you will- by a master race of giant space ants. It's difficult to tell from this vantage point whether they will consume the captive Earthman or merely enslave them. One thing is for certain: there is no stopping them; the ants will soon be here. And I, for one, welcome our new insect overlords. I'd like to remind them as a trusted TV personality, I can be helpful in rounding up others to toil in their underground sugar caves."