Blonde patient

A girl says to her doctor, "You have to help me. I hurt all over."

She touches her right knee with her index finger and says, "Ow! That hurts."

She touches her left cheek with her index finger and says, "Ouch! That hurts, too."

She touches her right earlobe with her index finger and says, "Ow! Even that hurts."

The doctor says, "Are you a natural blonde?"

She says, "Yes."

The doctor says, "You have a sprained finger."