24. Avengers: Infinity War
Obviously, everybody knew that Avengers: Infinity War was only the first half of a two-part story, and the good guys would always win out in the end, but that doesn’t make the ending any less impactful.
It’s rare that any comic book movie ends with the bad guy winning, never mind wiping out half of all life in the universe and turning the majority of the Marvel Cinematic Universe’s biggest names to dust.
It left audiences with their jaws on the floor when Thanos basked in the glory of accomplishing exactly what he set out to do, especially when fans had to wait an entire year for the conclusion.