20 More So-Called Happy Movie Endings That Absolutely Aren't

20. X-Men: Days Of Future Past

Time travelling stories can be a tricky business, as there is typically always some loophole or some aspect that doesn't quite make perfect sense. X-Men: Days of the Future Past was actually pretty tight in this regard, but there were still certain consequences that weren't truly explored.

When Professor X and Magneto (Patrick Stewart and Ian McKellen) sent Wolverine (Hugh Jackman) back in time to save the world from a terrible dystopian fate, they were successful in that when Logan returned to the present, things were much better.

This essentially retconned everything that happened in the original trilogy, and though several members of the team survived through to 2023 this time, there is no telling what other consequences there were. The theory is that even the tiniest changes in the past could cause a huge ripple effect, and in doing something as big as this, who could possibly say what else changed.

Tony Stark (Robert Downey Jr.) once said that when you mess with time, it tends to mess back, and there is absolutely no way that every single change, no matter how big or small, was for the better. There's not even a guarantee that such a future was actually stopped and not just delayed, and who knows, such meddling may have directly put the universe on the path that led to Logan's ultimate death, and the subsequent crumbling of the entire reality.