It's so fucking condescending to come to the counter (be it at the grocery store, at the mall, hotel, or whatever) ON THE PHONE, and still expect the clerk to do their job. How am I supposed to check you out properly? I'm supposed to confirm method of payment and the charges, let alone get a signature. But if I do that, then I am interrupting your oh so important call. The other option is the passive aggressive option (which I prefer). I wait. Eventually they will realize that I won't do anything until the treat me like a human being. Eventually.