Season 8, Episode 9: "The Abstinence"

- That is so unprofessional. - Oh, relax, Katie. It's not a problem.

- What is Borax? - Yes, you are right.

They bump you in junior high...

...next, you're being bumped in high schools, colleges, trade schools.

Before you know it, Letterman won't return your calls.

- You got an ashtray? - I don't have any ashtrays.

Jerry, don't freak out. I'll take care of you.

- Katie, don't-- - All right. Thanks.