A Scotsman went to the dentist and asked how much it was for a tooth extraction.
"$85 for an extraction, sir," was the dentist's reply.
"Och, huv yer no got anythin' cheaper?" replied the Scotsman.
"But that's the normal charge for an extraction, sir."
"What about if yer din't use any anesthetic?" asked the Scotsman hopefully.
"Well, it's highly unusual, sir, but if that's what you want, I suppose I can do it for $70."
"Hmmmm, what about if yer used one of your dentist trainees and still without anesthetic?" 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."
"Och, that's still a bit much. How about if yer make it a trainin' session and have yer student do the extraction with the other students watchin' and learnin?" asked 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.
"Och, now yer talkin' laddie! It's a deal," said the Scotsman. "Can ye confirm an appointment for the wife next Tuesday?"