The Shining (1980)

The official "The Shining" trailer seems to have disappeared from YouTube and replaced by spoofs, but it can be viewed here. Regardless...

From IMDB:

Stanley Kubrick, known for his compulsiveness and numerous retakes, got the difficult shot of blood pouring from the elevators in only three takes. This would be remarkable if it weren't for the fact that the shot took nine days to set up; every time the doors opened and the blood poured out, Kubrick would say, "It doesn't look like blood." They had tried shooting that scene for an entire year.

I'm looking for the how-to of this scene and will return to update...