This happens to me every time I ride an elevator. It's a short film directed by Vincenzo Natali, not to be confused with Natalie Portman. Natali is the guy who did Cube, which I liked (and some other films which I didn't like as much). Natalie Portman is someone else.
The lesson is as important today as it was back in 1996: BE CAREFUL ON THE ELEVATOR BECAUSE YOU WILL DIE.