There was a thirteen-year-old boy who was taken to the dentist's office for his annual checkup.  The dentist discovered some problems, and decided he could handle the situation right then and there. 

The boy said that it was ok with him -- the mother agreed with him -- and the dentist started in.  At first, he was causing some bleeding.  The mother started to get a little bit unnerved.  However, the nurse said, "It's ok to cry."

The boy groaned a bit from the pain, but held fast.  The mother was acting like she would faint, so the nurse brought her a chair to sit down. 

After the dentist finished working on her son, Mom said, "Didn't you
hear the nurse when she said it was ok to cry?"

The boy said, "Yes, Mom, I heard her... but I thought she was talking to you!"