Season 3, Episode 23: "The Keys"

-No, no, no. -Please, Kramer.

See? You're avoiding the middleman.

You'd give her her keys, which she would give to me.

So instead of giving them to her, you give them to me.

Unfortunately, when she gave you yours, you didn't give her hers.

She'd give them to me because she has mine.

Then I wouldn't have to ask you for hers...

...so that I could get mine.