It's always an embarrassing social moment -- trying to pretend you've seen a hugely important movie which you know nothing about. BBC News helps you fake your way with bluffers' summaries of classic movies, including Gone With The Wind and Citizen Kane.
Picture by Wikimedia Commons
While there's lots of information about any given movie out there (iMDB and Wikipedia are the obvious places to start), the advantage of this kind of guide is it tells you the key details without bogging you done in unneeded detail. I really could have used one of these for the original Star Wars, which I didn't see until I was in my twenties.
If your biggest movie worry is when you can safely take a bathroom break, check out previously mentioned RunPee.
How to pretend you've seen a classic film [BBC News]