My favorite....

"My friend Wilma has a t-shirt with a picture of a garden on it. She has the biggest (blank)s you've ever seen."

Forget who wrote it, but the answer was "Asparagus tips".

"Asparagus tips". HA!

Charles would have said, "Melons."

I was thinking pussywillows. No idea why, since in retrospect it doesn't make sense as a double entendre.

The "off" answers are what made the show so funny.

Watermelons.

Kiwi Fruit

Compost heaps.