A man makes an appointment to see his dentist to have a bad tooth pulled. He reminds the receptionist that the last time this happened he had a severe reaction to the anesthesia and doesn't do well with pain medication.
When he arrives, the dentist promptly instructs his dental assistant to give him a little blue pill. The man is sure that he's seen the pill before.
"Isn't this Viagra?' he asks. The dentist assures him it is. "And that will really do something for the pain?"
The dentist shrugs. "No, but it will give you something to hold onto while I yank that tooth."