You'll get weird looks if you haven't seen the common ones like Star Wars (especially in geek circles), The Matrix, Jurassic Park, the Batman movies, etc.
I haven't seen Star Wars, in fact, it's so fascinating to people it almost always starts a conversation.
If people are not talking to you because you haven't seen star wars I hate to say they are either not worth your time or your breath smells bad!
There's no way you're going to know any reference, just ask, there you go you started a conversation.