A guy walks into an exotic meats butcher shop and inquires about one of their signature meats, various types of brain.
The butcher said, "Oh we have all kinds of brain here, fish brain, cow brain, pork brain, little bitty bird brain" he then looked side to side to be sure nobody was listening and added "we even have human brain".
"Human brain!" the man replied.
"Oh yes, it's very popular, though it is not cheap" said the butcher.
"How much is it?" the man inquired.
"Well, we start off with general laborer brain which goes for $5/oz and go as high as lawyer brain which is $20/oz. Sometimes we get surgeon brain which we sell for $30/oz and the most expensive brain we have sold is knifemaker brain for $50/oz" the butcher replied.
"$50 an ounce for knifemaker brain!" said the man incredulously "that doesn't make any sense!"
The butcher narrowed his eyes and asked "Do you know how many knifemakers it takes to make an ounce of brains?" "And then you got to clean them!"