Scary, not funny.

'scuse me mate, how much is that book in the window, Aarrgghh!! it's War?

Nineteen ninety nine, I say.

What's that, about a tenner then?

Err, no, it's nineteen ninety nine.

Yeah, but what's that? I don't do money. I only do tens and twenties. Is it ten quid, or is it closer to twenty?

It's closer to twenty, I say.

Twenty?

Yes, twenty.

Goes back outside to his waiting mate. It's only twenty quid, that's not bad. I'm going to come back later and buy* one.

K looks on, bemused and a bit alarmed.

[Corrected - as K points out, it doesn't do for the illiterate to be poking fun at the innumerate...]