A psychiartrist walks into a brain shop, and says to the propriator "Hello. I am here to do some reasearch on human brains. What do you have in stock?"
"Well," propriator began, "We have some Harvard MBA brains at $10 a pound. We also have a few NASA brains going for about $100 a pound. And, just in today, we have some fresh violist brains."
"How much are they?" the scientist inquired.
"$1000 a pound."
"Wow! That's expensive! Every orchestra has them. Why are they so expesive? Are they really high quality?"
"Well, no, they're about average. But, do you know how many violists you have to kill to get a pound of brains?"