The IT Crowd, Series 4

[The 8+ Club are playing Street Countdown]

Harold Tong, aka "Prime":
Eighteen letters, I've never seen so many... he is the One.

Roy:
[incredulously] What are you...

Prime:
Shh! This is the longest word yet on Street Countdown! Unlike normal Countdown, you see-

Roy:
I don't care.

[The 8+ Club finish an acapella version of the Countdown music]

Prime:
Negative One?

Negative One:
Twelve.

Moss:
Sixteen.

Prime:
Your word, Negative One.

Negative One:
Enormousness.

Moss:
I shall give my answer, if I may, in the form of a joke.

Prime:
This is most irregular...

Moss:
What do you call Negative One sitting alone in an empty room?

Prime:
I don't know, what do you call Negative One sitting alone in an empty room?

Moss:
Overnumerousness!

Prime:
Gyles?

[Pan to Gyles Brandreth in Dictionary Corner]

Gyles:
Yes, that is a word! And the joke does make sense!