Three is the magic number?Three Musketeers, Three Blind Mice, three trained marksmen stationed at different points in Dealey Plaza.* Jurassic Park III follows the great tradition of movie trilogies where the person or persons responsible for the success of the first two decided to do something else while they still had a career, leaving whoever happened to be available at the time to finish the job?for further examples, see The Mummy, Scream and The X-Men series.