Season 4, Episode 6: "The Watch"

Dad, you're sure you don't need more money?

-Jerry. -All right, I'm just joking.

Listen, have a nice trip.

-Bye, Mrs. Seinfeld. Take care. -Thanks again for the wallet.

-Morty, always a pleasure. -Yes.

Take care, now. So long.

-Yeah, like he'd take your money. -He took it. I put $400 in the wallet.

He lost all that cash. It was the only way I could give it back.