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Summary: Two baby squirrels ask grandpa to explain what "men" are when he comes in singing "peace on earth, goodwill to men". Grandpa tells the story of man's last war. (imdb)
Very daring for its time and medium with some awesome rotoscoping and a cutesy opening that catches you completely off guard. Manages to succeed despite the almost laughable demonization of mankind (seriously, someone show this to the Nostalgia Critic - he'd have a field day).