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