Funny Phone Manners

It's kind of funny that when someone calls a phone number by mistake, we answer, "I think you have the wrong number." Don't we know that it was a wrong number? It just sounds more polite than saying, "You idiot. You called the wrong number."

And when someone needs to get off the phone, you'll hear, "I'd better let you go." This gives the impression that the other person is doing you a favor, but you weren't the one trying to end the call.