I just noticed that when you search for a business with Google Maps it gives you an option to call the business via google. You enter your phone number and google calls you. When you answer it connects you to the business.
Seems way too tempting to prank people, although I guess it would only cause a couple of confused people on the phone.
I wouldn't doubt it is a repost. But I guess its lame anyway. This looks like more fun http://phonetrick.com/ And I would give that a %99 chance of repost. I seem to be good a being last to find the good stuff.