6. Preacher & McAllister - Deep Blue Sea
Deep Blue Sea is not a good movie by any stretch of the imagination, but at least the filmmakers had the sense to listen to test audiences who, for once, were actually right about something. The original state of the film had LL Cool J's wise-cracking Preacher die, while Saffron Burrows' straight-laced Dr. McAllister would live, yet quite ironically, audiences didn't like McAllister while finding themselves hugely rooting for Preacher, and so the studio took note of this, essentially switching their fates around. We'll never know exactly how the original cut was different, but it's difficult to see how anyone could have thought killing Preacher was a good idea, given that his "You killed my bird" line is the best thing in the entire movie, while Burrows' scientist character is utterly forgettable and boring, worthy of a nice, gory death, then.