There are lots and lots of common Sci-Fi themes seen in films, such as cloning and sticking funny hats on two people and swapping their minds over! If you'd like to suggest a new topic then contact us and let me know.
In terms of the two I just mentioned. Cloning we can do now (remember Dolly the sheep?), but mind transfer is a long way off if ever. The reason is similair to the argument I used for teleportation and the quantum fluctuations of the atoms within the brain and would be impossible to record, transfer and replicate.