"Half a century ago, Magneto was implicated in the mutant plot to assassinate President John F. Kennedy. The events of that fateful day in November have been a point of contention between humans and the mutants ever since..."
This fascinating video that's been uploaded by the X-Men franchise to promote "Days of Future Past", is aiming to connect the dots between the assassination of JFK and the "mutant" conspiracy. Titled "The Bent Bullet", though an obvious plug for the new movie, it's still quite interesting none-the-less.
http://youtu.be/ByCY2UYLHG8
X-Men: Days of Future Past will be in cinemas on May 23, 2014 and will boast an all-star cast including Patrick Stewart, Ian McKellen, Hugh Jackman, Michael Fassbender, James McAvoy, Jennifer Lawrence, Halley Berry, Nicholas Hoult, Anna Paquin, Ellen Page, Shawn Ashmore and Peter Dinklage.
For the more geekier details on this JFK conspiracy, head on over the
The Bent Bullet, where they discuss at length the event.