A Scotsman goes to the  dentist and asks how much it is for a tooth extraction.  "$85 for an  extraction sir" was the dentist's reply.

"Och... huv ye no got  anythin' cheaper" replies the Scotsman getting agitated.  "But that's the normal charge for an  extraction sir" said the dentist. "What about if ye  din't use any  anesthetic?" asked the Scotsman hopefully.

"Well it's highly  unusual sir, could be quite painful, but if that's what you want, I  suppose I can
do it for $70" said the dentist.

"Hmmmm, what about  if yer used one of your dentist trainees and still without anesthetics"  said the  Scotsman. "Well it's possible but they are only training  and I can't guarantee their level of professionalism and it'll be a lot  more painful. I suppose in that case we can bring the price down to say $40" said the dentist.

"Och... that's still a bit much, how about if ye make it a trainin' session and have yer student do the extraction  and the other students watchin' and learnin" said the Scotsman hopefully. "Hmmmmm, well OK it'll be good for the students I suppose, I'll charge you only $5 in that case" said the  dentist.

Now yer talkin' laddie! It's a deal" said the Scotsman.  "Can you confirm an appointment for the wife on Tuesday?"