A dentist was understandably nervous at his first extraction. His hand shook as he got the molar out. He lost grip on the instrument, and the tooth trickled down the patient';s throat. "Sorry...." said the doctor, "you're outside my specialty now. See a laryngologist, [throat specialist]."
By the time the unfortunate victim got to the laryngologist, the tooth had worked its way much further down. The laryngologist examined the man. "Sorry...."said the doctor, "you're outside my specialty now. You should see a gastroenterologist! [stomach specialist]."
The gastroenterologist X-rayed the patient. "Sorry...." said the doctor, " the tooth has traveled into your lower intestines. You should see an entomologist! [intestinal specialist]."
The entomologist took some X rays. "Sorry, the tooth isn't there. It must have gone down farther. You should see a proctologist! [a specialist in diseases of the rectum;].
Our patient is now on the proctologist's examining table, in the proper elbow-knee position. The doctor has inserted a proctoscope and is looking through it....
"Good heavens, man! You've got a tooth up there! You should see a dentist!"