How about this one
A young brunette goes into the doctor’s office and says that her body hurts wherever she touches it.
"Impossible," says the doctor. "Show me."
She takes her finger and pushes her elbow and screams in agony. She pushes her knee and screams again, pushes her breasts and with a face of horror she sighs, and so it goes on.
The doctor says, "You’re not really a brunette, are you?"
She says, "No, I’m really a blonde."
"I thought so," he says. "Your finger is broken."