A Nurse Notices That A Doctor Is Walking Around With A Rectal Thermometer Behind His Ear. Embarrassed, She Pulls Him Aside To Discreetly Inform Him...

"Doctor," says the nurse, "you've got a rectal thermometer behind your ear."

The doctor pulls the thermometer from behind his ear and looks at it incredulously. "Nurse, do you know what this means? Some asshole's got my pencil!"