My direct number at work used to belong to a mortgage company. When my caller ID shows a number I don't recognize immediately, I generally answer with my company's name, just in case. And yet, 9 out of 10 people will just launch into what they intended to say, regardless of what I say. I would like to say "Pizza Hut," or something equally unmistakable, except that I don't always recognize our own clients' phone numbers right off the bat. And I wouldn't especially like to be unemployed.
Probably the funniest call I got was from the toner pirates. I get this term from one of my former jobs, where we got a call offering us toner at rock bottom prices, from some company with which we had never done business. Upon calling our copier rep, he said, "Them's toner pirates, honey!" The toner pirates called here, probably thinking they were calling the mortgage company, and asked for the serial number of my photocopier so they could get some toner out to me for a lower price than anybody else.
Me: We don't have a photocopier.
Pirate: You don't?
Me: No, the building owns them, we just use them.
Sometimes, it's fun being me.