Movie studios consider tons of ideas during the early stages of filming any big-budget picture. Ultimately, many ideas are scrapped and replaced with alternative endings that are safer for audiences or can ensure possible sequels.
But a lot of deleted movie endings are so mind-bending and awesome that they might have changed the entire film… and made it a whole lot better. Although the final product was usually successful, the finished movie might be a lot less interesting without its originally intended ending.