Been around awhile it seems, but I'd never seen it before: Abbot and Costello in the computer store:

ABBOTT: Super Duper Computer Store. May I help you?

COSTELLO: Thanks. I'm setting up an office in my den and I'm thinking about buying a computer.

ABBOTT: Mac?

COSTELLO: No, the name's Lou.

ABBOTT: Your computer?

COSTELLO: I don't own a computer. I want to buy one.

ABBOTT: Mac?

COSTELLO: I told you, my name's Lou.

The scary thing is how closely this resembles most of my support calls.