Alternate endings often shed a different light on a film we thought we knew well. They reveal fascinating insights into the creative process, the chance to look at how a great film is often just a happy accident, and also a chance to see just how mental and awful most filmmakers' ideas are.
Alternate endings are nothing new nor a product of film–Ernest Hemingway wrote an alternate ending to A Farewell to Arms (they all fight off a zombie plague in the end, then high-five), but it's with film that you have the opportunity to actually see the alternatives or find out the most about them. After all, filmmaking is one of the most collaborative processes around, with everyone wanting their input. I've tried to list the most interesting endings I could find, both good and bad, but I'm sure there's some I may have missed, so please chip in below.