Season 5, Episode 7: "The Nonfat Yogurt"

You're practically havin' sex with 'em.

You? You're gettin' old.

Maybe your yogurt isn't so nonfat.

Oh, guess again, tubby.

Jerry, there's gotta be a way we can find that out.

There must be some lab that would do that kinda thing.

Oh! I've got it! What?

I'll call the Food and Drug Administration.