That scene from Ruthless People is one of my favorites. The downside of not answering wrong numbers is missing out on the fun I used to have with them. But these days, most of the numbers I don't recognize, I don't want to talk to.
TAC, your post reminded me of a somewhat reversed situation. We were having some issue with our phone bill, and when we first moved, my wife had set up all the utilities and stuff, so everything was in her name. I'm the one who handles the bills, and it's usually not a problem, except apparently with certain idiots.
AT&T: This is AT&T Customer Service, how can I help you?
Me: Hi, my name is Bob -----, and I'm having a problem with our phone bill. Our phone number is xxx-xxx-xxxx.
AT&T: Please wait a moment while I look that up. (pause) Is this Ann -----?
Me: Uh, no, this is Bob -----, her husband.
AT&T: I'm sorry, but only the account holder can make changes or inquiries to the account.
Me: But this is her husband, and I'm the one dealing with the bills.
AT&T: I'm sorry, but only the account holder can make changes or inquiries to the account.
Me: Okay, hold on, let me get my wife.
I cover the phone for a second. Then I start talking again, making absolutely no effort to disguise my voice.
Me: Hello, this is Ann -----.
AT&T: This is Ann -----??
Me: Yes it is.
AT&T: (pauses, has no idea what to do)
Me: Look, we're having this problem with our bill.
AT&T: I'm sorry, did you say that this is Ann -----?
Me: Yes. My husband said that only the account holder can make changes or inquiries to the account, and I am telling you that I am Ann -----. My phone number is xxx-xxx-xxxx, and I need to speak with you regarding our bill.
She had no choice. She dealt with me. Afterwards, I laughed much.