STAIRS, a very funny short story.

Bill, Jim, and Scott were at a convention together and were
sharing a large suite on the top of a 75 story sky scraper.
After a long day of meetings they were shocked to hear that the
elevators in their hotel were broken and they would have to climb
75 flights of stairs to get to their room. Bill said to Jim and
Scott, let's break the monotony of this unpleasant task by
concentrating on something interesting. I'll tell jokes for 25
flights, and Jim can sing songs for 25 flights, and Scott can
tell sad stories the rest of the way. At the 26th floor Bill
stopped telling jokes and Jim began to sing. At the 51st floor
Jim stopped singing and Scott began to tell sad stories. "I will
tell my saddest story first," he said. "I left the room key in
the car!"