A man asks this dentist what it would cost to remove a tooth. "One hundred pounds," says the dentist.
"That's a lot," says the man, "is there anything you can do to get the price down?"
"Well, if I don't use any anaesthetic that'll bring it down to £50," says the dentist.
"Okay," says the man, "anything else you can do to make it cheaper?"
"If I just used a pair of pliers that would bring it down to £15," says the dentist.
"That's still slightly more than I wanted to pay," says the man.
"Right," says the dentist, "we'll do it without anaesthetic, using the pliers and I'll get one of my students on work experience to do it. That would bring the price down to a fiver."
"Excellent!" says the man.
"Okay," says the dentist as he prepares to make a note of the appointment, "what's your name?"
"Oh, it's not for me," says the man, "It's for my wife."