Mazda has a new commercial that has a tone exactly like my doorbell. Freaked me out the first time I heard it.
My dog used to get ripped on the doorbell sounds on TV. He is now far better than me at knowing which one is really ours.
God help the postman, however. I don't know what it is about postmen, but Peppi would kill him if he could get at him. I have taken to keeping him inside when the postman is due to arrive.