Sherlock Jr.

Not only is this Buster Keaton's best film, but it is among the greatest achievements in the history of cinema, period. While it is not a feature-length film--and thus barred from most critics' lists of great films--it invented just about every single basic special effect known to movies (except for morphing). The story itself, about a film projectionist who desires to become part of the movies, and then does, by walking right onto the screen, made palpable the desire that we all have to be in the movies: To get the girl, to be an action hero, to outsmart the bad guys. Keaton invented meta-cinema before anyone even had a phrase for it.

This movie has entered our dreams.