Edge of Tomorrow
The conclusion to this film is hard to grasp and doesn't really make sense to most viewers. Every time the main character, William Cage, dies, he is sent back in time to the same exact moment. In the end, he finally defeats the aliens that he's meant to kill, but he still dies.
Happily Ever After?
The confusing part is that after he dies that final time, he wakes up exactly where he started once again... this time, the win over the aliens still stands. This is a classic "happily ever after" ending that Hollywood loves, but most viewers don't understand it and felt like it was a copout.