One day, a man walked into a dentist’s surgery and asked how much it would cost to extract a wisdom tooth.
“Forty quid,” the dentist said.
“That’s a ridiculous amount,” the man said. “Isn’t there a cheaper way?”
“Well, the dentist said, “if you don’t use an anaesthetic, I can knock the price down to 30 pounds.”
Looking annoyed, the man said, “That’s still far too expensive!”
“Okay,” said the dentist. “If I save on time and simply rip the tooth out with a pair of pliers, I can knock the price down to 10 pounds.
“Nope”, moaned the man, “it’s still too much.”
“Well,” said the dentist finally, scratching his head, “if I let one of my students do it using pliers, I suppose I can knock the price down to a fiver.”
“Marvellous!” said the man. “Book my wife in for next Tuesday!”