Season 4, Episode 7: "The Bubble Boy"

I saw you on The Tonight Show a couple of weeks ago.

I was watching the show with my son Donald.

He's got this rare immune deficiency in his blood.

The damnedest thing. Doctors say he has to live in a plastic bubble.

Can you imagine that? A bubble.

-A bubble? -A bubble?

-Do you mind? May I? -Oh, sure.

It'd break your heart seeing him in there.