An alien walked into a shop and told the owner that he came from Mars and wanted to buy a brain for research. How much is this one? he asked. Well that one is a monkey brain and its $20, he explained. How much is that one? he asked Well that one is a female brain and its $100. he explained.And how much is that one? he asked. That one is a males brain and it is $500 he explained. Why so expensive? the alien asked. Well it has hardly been used!