The patient went to his doctor for a checkup, and the doctor wrote out a prescription for him in his usual illegible writing.

The patient put it in his pocket, but he forgot to have it filled. Every morning for two years, he showed it to the conductor as a railroad pass. Twice, it got him into the movies, once into the baseball park, and once into the symphony.

He got a raise at work by showing it as a note from the boss. One day, he mislaid it. His daughter picked it up, played it on the piano, and won a scholarship to a conservatory of music.