The Sea of Trees
This Cannes film did poorly when it came to theaters, due in part to the ending. This harrowing look at grief and friendship ends with the main character learning something about his new friend. Turns out, the man that he had met was actually his dead wife's spirit. Weird...
War of the Worlds
The crime of unrealism is the reason fans didn't love the ending of this Speilberg film. Despite the entire city of Boston crumbling around them, every member of the Ferrier family escapes without injury. Viewers didn't believe that aliens wouldn't get at least one of these heroes!