The perfect place to procrastinate while doing work and not feel completely guilty: Prof. Knill’s math movies site. I think I’ve watched maybe 5 or 6 of the movies listed.
Next on my list:
3. Fermat’s room
Although if you really want to be confused and left wondering why you decided to procratinate in the first place, see this film. (Note: This is not Flatland: The Movie, which I presume to be more faithful to the book…and probably better?)