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 anesthetic, I can knock the price 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 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.” “Marvelous, ” says the man, “book my wife for next Tuesday!”