Season 4, Episode 20: "The Junior Mint"

...the art could really be worth something.

-We gotta confess. -Really?

-Yes. -We could be tried for murder.

I can't have this on my conscience. We're Leopold and Loeb.

-You're not saying anything. -You can't stop me.

No, you're not!

Hey, Elaine, put me down for some of that art.

Nineteen hundred dollars' worth.