This question is for those of you who either self-identify as a "geek" or love someone who is. Some friends and I have been getting together to watch movies, and for the benefit of one of the younger members of the group, we've been sharing "geek cred" movies - movies that one must see to hang around with gamers, SCA members, and the like. We've covered the most obvious, like "Lord of the Rings", "Star Wars", "Monty Python and the Holy Grail", and "Army of Darkness". We're getting ready to start a "Firefly/Serenity" marathon. I'd like to hear suggestions from you guys, though, as to what movies you think one must see to credibly claim to be a "geek".