Season 8, Episode 16: "The Pothole"

Didn't even give you a hint?

No, could be anything. The whole apartment's a biohazard.

You know what I bet it is? Your remote.

Yes, that is a definite possibility.

Or it could be your Walkman there.

- Are you just screwing with me? - Yeah, I am.

- Hey. - How's life on the road?

- I'm making a difference, Jerry. - I don't doubt it.