One day, a man walks into a dentist's office ...

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 aesthetic, I can knock the price down to $60." Looking annoyed the man says, "That's still too expensive!" "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