If we didn't have alternative endings to video games anymore, though, we would never have gotten this gem!
Now that would have been a damned shame, no?
[sub]It is technically an alternative ending, as it deviates from the original, unaltered ending.. shut up.[/sub]
Also, the same general principle applies. If it is done tastefully, it will work. If it is half-assed, it will not. Mass Effect 1/2, Heavy Rain and Dragon Age: Origins have pulled it off perfectly in the past.