1. The busy signal when you're on the other line
  2. Lying down and putting the receiver to your ear when you're tired
  3. The sound of a dial tone
  4. The ability to ask "who is this?"
  5. The surprise of who is on the other end
  6. Lying and saying the battery on the cordless phone is dying.
  7. Plugging in the cord.
    It was such a fantastic shape that fit like a puzzle piece and made a satisfying click sound.
  8. Seeing the red light blinking on the answering machine.
  9. Dangling the receiver by the cord and watching it untwist itself.
    Suggested by   @DG
  10. Having the operator do an emergency breakthrough if your friend's line was busy too long lol
    Suggested by   @tntsoto