Mark Twain Live (on film)

Here's the only known video footage of Mark Twain, taken in 1909 by Thomas Edison:

Twain had already been adapted to film at this point, with Tom Sawyer premiering in 1907.  The film is now lost, and there doesn't seem to be any record of Twain's thoughts about the film.  

Twain was a big fan of technological innovation, and a friend of both Edison and Tesla.