Here's the quotes between Gladys and Abner:

Glady's: I'll be she has some strange disease and we could catch it. Do you want to wake up with something strange?

Abner: I've been doing that for 20 years.

Does anybody know what episode that is from? I think I missed it, since I saw the episode "Splitsville" which mentioned the Kravitz's being married for 22 years.

I think thats from 'Take Two Aspirin and Half a Pint of Porpoise Milk,' but I'm not sure I'd have to rewatch that episode to be positive.