For background, I refer you to this post, telling you all you need to know about the silent film by Fritz Lang called Metropolis. In that post, I point out that somebody had discovered what is believed to be the full original uncut version of the film.
That version is being shown today, over the Internet, for free. Unfortunately, it is being shown to French and German audiences, but that's okay because it IS a silent movie. The stream begins at 8:15 p.m. Berlin time on Feb. 12 — an hour earlier in the UK and Ireland, six hours earlier on the US East Coast, seven hours earlier in Chicago, and so on.
Roger Ebert's site has the details and links.
Here's a clip from the 1984 "restoration" of Metropolis, a re-edit of the film that was compiled by Giorgio Moroder, using a contemporary soundtrack.
UPDATE: Well, what the hell — I'll embed it. It's not quite what I hope it would be: