All praise Herr Friedemann Wachsmuth, for he has created a Super 8 movie projector using only Lego Technic, lens, reel spindles and a LED flashlight. Watch it in action. It's bloody brilliant.
The projector is not just a quick hack, but a full-featured machine, with 24 frames-per-second playback, automatic feeding and 120mm reel support. [Peaceman]