Despite being a genre that has practically an infinite well of source material to draw on, the twists in comic book movies often end up being rather predictable. The films usually draw from the most famous stories, so why wouldn't they be? At least for comics fans.
It's not as though the Winter Soldier wasn't going to be Bucky, or a different person was going to form the Sinestro corps. All of these supposed twists are about as shocking as Bruce Wayne being Batman, even for those that only have a passing knowledge of the books.
In a few cases comic book movies have managed to be surprising though, whether that be because of an unexpected incident of fan service, a massive diversion from the comics or, in the worst cases, silly writing.
Most of these cases are surprising as few hints were planted prior to the moment, making them truly shocking. Just imagine how astonishing Cap wielding Mjolnir would've been had he not almost been able to do so two Avengers movies beforehand!
Foreshadowing is all well and good, but the following moments - either for better or for worse - all prove that the most shocking moments are those that come out of the blue.
10. 'Bro' Thor
Up until their third film, the Avengers able to triumph over any threat, no matter how seemingly insurmountable, and yet they were still unable to stop Thanos from taking the lives of billions - such decisive failure was always going to impact on their mental health.
Even with that in mind, predicting that Marvel would highlight Thor's sense of hopelessness in this way would be as great a feat as obtaining the six infinity stones, as this was truly a new direction for the God of Thunder.
That's not to say it was a bad one though: the choice was bold, brave, unique and even served a story purpose. Perhaps the more shocking element of this moment was that Thor did not suddenly revert to being slim later in the movie, a choice some may argue is even bolder than the original decision itself.