Reminds me of a short story I read as a kid.
Someone receives a call from an unknown number and answers. (In the original I read, the setup was a payphone ringing as someone walked by.)
On answering the phone, that person hears a voice saying "excuse me, may I have a moment of your time?" "Sure," says the answerer. "Thank you," says the voice as it disconnects.
The answerer hung up also, feeling a bit older.
