Check out You-tube's marvellous trailer for Titanic-2. It's superb.
I don't normally look at You-tube, but I was alerted to this trailer by someone on another site - I couldn't tell if they were taking it seriously or not - and had a look. It has all the hallmarks of the typical Hollywood blockbuster trailer, but the more you look, the more you see it's made up of shots from dozens of other films. Wonderfully done.