V FOR VENDETTA (2006)
Formation of dominoes that V tips over to form the letter "V" took 22,000 dominoes, 4 professional domino assemblers and 200 hours to set up.
This video has the violent riot clips edited out, but you get the point. (No spoilers in this clip, I promise.)
Click here if you want the full, EPIC montage. Beware of spoilers!