Though it may not have reached the level of box office glory of the towering Marvel Cinematic Universe, the X-Men franchise is nevertheless an immensely popular adaptation of the classic Marvel comic book series. Furthermore, without Bryan Singer's original 2000 movie, who knows when studios would have begun to put their faith in comic book characters that weren't called Batman or Superman? X-Men's success paved the way for the glut of superhero movies that followed, and shaped how the blockbuster landscape stands today. With 7 films released over the last 14 years and an eighth film on the way in 2016, the series is showing no signs of slowing down, maintaining a consistent cast, led of course by the inimitable Hugh Jackman. Though the majority of the films are pretty good (some glaring exceptions aside), even the better films in the series present audiences with more than a few crazy truths that just have to be accepted in order to enjoy the series. With the major shake-up that was this year's retcon-heavy Days of Future Past, that is now more true than ever. Without any further ado, here are 16 crazy facts you just have to accept to enjoy the X-Men franchise...