A fun little viral video has been released for X-Men: Days of Future Past that reveals a conspiracy theory called "The Bent Bullet" that links Magneto to the assassination of John F. Kennedy.
"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. After years of incarceration, do you think Magneto is guilty or innocent? Tell us why in the comments." - The Bent Bullet
There's a whole website dedicated to the conspiracy theory that you can check out here.