If you have nothing to do pay the moving image archive site of archive.org a visit. They offer more than 26000 movies to watch and download for free. Everything is neatly categorized including categories like open source movies, featured films and prelinger archive. You have lots of old movies from the black and white era but also new ones that were made with computers.
Fortunately they have a good site wide search tool that lets you search the different categories or the whole movie archive for certain topics, e.g. war. You can also browse an entire collection or use certain keywords / authors to do so. Most movies have a review and user opinions that give you a rough overview about it. Oh, and you have the option to stream or download the movie in various formats.
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[...] Vía gHacks llego a Internet Archive (IA), un proyecto muy interesante y muy muy y hasta 3 veces muy grande, pues pretenden ser “la biblioteca de Internet”, ofreciendo acceso permanente a la multitud de colecciones de textos, libros, webs, software, vídeos, etc. que llevan archivado hasta el momento; esto puedo ser realmente útil para historiadores, investigadores, estudiantes o cualquier persona que necesite acceder a un documento susceptible de ser archivado en el IA, lo que puede ahorrar muchas horas de búsqueda en Google. [...]