Season 4, Episode 17: "The Outing"

Actually, it was in gym class. I was trying to climb the ropes...

...and Jerry was spotting me.

And I kept slipping and burning my thighs.

And then finally I slipped, and I fell on Jerry's head.

We've been close ever since.

Do you guys live together?

-Live together? -No, I got my own place.

Oh, and do your parents know?