At the museum where I work we don't have a receptionist for the office. Callers to our main line are given a message with the current exhibition and hours of operation; for a menu with more information they're instructed to press 5, or to leave a message just wait for the tone.
Today I was checking the messages and I heard a faint clicking noise that I couldn't place at first. Then I realized it was a rotary dial. Then a pause, and then a frustrated elderly voice said "that was five."