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2. Alien

Now, this stands out as the ending which would have rendered the whole film hilariously awful had it been put in place. In one conceived ending, the xenomorph appears just as Ripley gets onto the spaceship, bites her head off, and uses her voice to communicate with earth. Ridiculous? Oh God yes, but think how much more entertaining the sequels would have been if they’d stuck with this terrible ending. That kind of avoidance deserves a medal.