Season 6, Episode 16: "The Beard"

-What are you looking for? -Tupperware.

Sorry. I don't have any Tupperware.

See, I knew this was gonna happen.

I just made a delicious casserole, but it won't keep...

...because I have no Tupperware.

-What about a plastic bag? -You must be kidding.

What is the difference?

The patented burp, Jerry. It locks in freshness.