Sorry to do this to you all again but this just had to be quoted
Woman: Mr. Simpson?
[Homer sets down the shotgun in Maggie's crib]
I believe something of yours struck my car yesterday.
Homer: Oh, yeah? Prove it.
Woman: [opens front door revealing the barbecue pit and bumper]
That's your license plate, isn't it?
Homer: Um ...
[sobbing] alright, just go ahead and sue me! Everybody else does! The average settlement is $68,000.
Woman: I'm not here to sue you. My name is Astrid Weller. I own an art gallery and I'd love to display your piece.
Homer: You mean this hunk o' junk? This isn't art; it's the barbecue that pushed me over the edge.
[shaking fist] Didn't you? Didn't you?! You stupid --
[kicks a pipe sticking out of it, bending it] Astrid: Art isn't just pretty pictures; it's an expression of raw human emotion -- in your case, rage.
Homer: Oh, I got that, lady.
Marge: [peeks around the corner of the house]
Is everything okay?
[so do the three kids]
I got worried when I didn't hear any shots.
Homer: This lady says I'm an artist.
Marge: You? An artist?
Astrid: Your husband's work is what we call "outsider art". It could be by a mental patient, or a hillbilly, or a chimpanzee.
Homer: [gasps] In high school I was voted most likely to *be* a mental patient, hillbilly, or chimpanzee!
Astrid: Well, you should be very excited because outsider art couldn't be hotter.
Homer: So you'd better catch the fever!
[shakes fist at Bart] Catch it!

One of the finer Simpsons episodes if I do say so