Little Johnny went to the Doctor to get a vaccination. After the shot, the Doc pulled out a Band-Aid and started to cover the spot on his arm. Johnny asked him to put it on the other arm.
The Doctor said, "I put the Band-Aid over where you got the shot to let others know that it's tender and they shouldn't touch it. Why do you want it on the other arm?"
Johnny answered, "You really don't know much about little boys, do you?"
