One day, at the dentist's office...

The dentist pulled out a numbing needle to give the patient a shot.

“No way! No needles!” the guy says. “I hate needles!”

So the dentist starts to hook up the nitrous oxide, and again the man protests. “No way! I can’t do the gas thing!” 

The dentist then asks the guy if he has any objection to taking a pill.

“No objection at all,” says the patient. "I’m fine with pills!”

The dentist then returns and says, “Here’s a Viagra.”

The patient exclaims, “Wow! I didn’t know Viagra worked as a pain killer!”

“It doesn’t,” replies the dentist. “but it’s going to give you something to hold onto when I pull your tooth.”