A woman took her baby in to see the doctor, and he determined that the baby had an ear ache. He wrote a prescription for ear drops.

For the directions he wrote, "Put two drops in right ear every four hours", abbreviating "right" with an R with a circle around it.

Several days passed, and the woman returned with her baby, complaining that the baby still had an earache, and his little behind was getting really greasy with all those drops.

The doctor looked at the bottle of ear drops and sure enough, the pharmacist had typed the following instructions on the label: "Put two drops in R ear every four hours."