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 it's $20,'' he explained.

''How much is that one?'' he asked ''Well that one is a male brain and its $100.'' he explained.

''And how much is that one?'' he asked. ''That one is a female 's brain and it is $500'' he explained.

''Why so expensive?'' the alien asked. ''Well, it is a very rare occurrence!''

(AW- Anil)