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One day a man walks into a dentist's office and asks how
much it will cost to extract wisdom teeth.

"Eighty dollars," the dentist says.

"That's a ridiculous amount," the man says. "Isn't there a
cheaper way?"

"Well," the dentist says, "if you don't use an anaesthetic,
I can knock it down to $60."

"That's still too expensive," the man says.

"Okay," says the dentist.  "If I save on anesthesia and
simply rip the teeth out with a pair of pliers, I could get
away with charging $20."

"Nope," moans the man, "it's still too much."

"Hmm," says the dentist, scratching his head.  "If I let one
of my students do it for the experience, I suppose I could
charge you just $10."

"Marvelous," says the man, "book my wife for next Tuesday !"