A short man discovered he was able to walk on the ceiling. One day he realized he could live on the ceiling and advertise for a roommate on the floor below. After interviewing several potential roommates, the short man settled on a very tall man. Unfortunately, the short man had not done his math correctly. The ceiling in the short man’s apartment was higher than average, but the tall man still had to move out. The reason the short man gave others was that he and the tall man had consistently bumped heads.