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
"Well," the dentist says, "if you don't use an anaesthetic,
I can knock the price down to £60."
"That's still too expensive," the man says.
"Okay," says the dentist. "If I save on anaesthesia and
simply rip the teeth out with a pair of pliers, I can
knock the price down to £20."
"Nope," moans the man, "it's still too much."
"Well," says the dentist, scratching his head, "if I let
one of my students do it, I suppose I can knock the price
down to £10."
"Marvellous," says the man, "book my wife for next Tuesday!"