The pretty young lady was at the dentists having a tooth extracted.
The dentist gave her the usual “This won’t hurt a bit” routine, before bending over her with a drill in his hand.
As he started the drill going, with that shrill sound that sets everyone’s teeth on edge, the dentist immediately drew back from his patient in complete alarm.
“Miss”, he said in a barely audible whisper, “You have hold of my testicles!”
“Yes, I know”, the pretty young lady smiled. “It’s just my insurance policy. We aren’t going to hurt each other, are we?”
Image used under a Collective Commons License from https://commons.wikimedia.org/wiki/File:TMJ_Dentist.png