Monty Python's Flying Circus1969

Encyclopedia salesman:
[rings doorbell] Burglar! [rings again] Burglar!

House wife:
[opens door part way] Yes?

Encyclopedia salesman:
Burglar, madam.

House wife:
Whatchu want?

Encyclopedia salesman:
I want to come in and steal a few things, madam.

House wife:
Are you an encyclopedia salesman?

Encyclopedia salesman:
No madam, I'm a burglar, I burgle people.

House wife:
I think you're an encyclopedia salesman.

Encyclopedia salesman:
Oh I'm not. Open the door and let me in, please.

House wife:
If I let you in, you'll sell me encyclopedias...

Encyclopedia salesman:
I won't madam, I just want to come in and ransack the flat, honestly.

House wife:
Promise no encyclopedias?

Encyclopedia salesman:
None at all.

House wife:
Alright. [unchains the door]

Encyclopedia salesman:
[stepping in] Mind you, I don't know whether you've ever really considered the advantages of owning a really fine set of encyclopedias, ya know. It can do you a really wonder...