A young woman went to her doctor complaining of pain.
"Where are you hurting?" asked the doctor. "You have to help me, I hurt all over," said the woman.
"What do you mean, all over?" asked the doctor, "be a little more specific."
The woman touched her right knee with her index finger and yelled, "Ow, that hurts." Then she touched her left cheek and again yelled, "Ouch! That hurts, too." Then she touched her right earlobe, "Ow, even THAT hurts", she cried. The doctor checked her thoughtfully for a moment and told her his diagnosis, "You have a broken finger."
Your index finger is your first finger, the one you usually point with.