You're adrift on a piece of driftwood in the middle of the Atlantic after the ship has sunk. If you're Rose in James Cameron's Titanic, apparently you are lying there staring at the stars. The wrong stars!
American astrophysicist, broadcaster, author and Director of the Hayden Planetarium in New York City, Neil de Grasse Tyson, pointed out to Cameron that the stars Rose was looking at were not correct for the time of the sinking. So for the 3D version Cameron reshot it.
OK, I kinda go with Tyson on this. After all, if you make sure the clothing, the furnishings, etc. are authentic, why any old sky?
And yet, even I might not be paying much attention to the stars if I were floating around on the Atlantic after a shipwreck. I might be thinking . . . well, what would *you* be thinking about?