The Reverse Peephole (a.k.a. The Man Fur) Season 9, Episode 12

Kramer

So, you're sleeping with Silvio's wife?

Newman

Well, there's very little sleeping going on.

Kramer

Well, why didn't you tell me about this?

Newman

Quite frankly, I don't see how it's any of your business.

Kramer

Well, it's my business now. Look, I stuck up for you. Man, if he catches you, we're both out.