Missing Media

As I continue to expand my boundaries of knowledge by reading and watching more books and movies, it occurs to me that there are some books/movies that are regarded as "classics" by culture, but that I've never had a chance to actually experience the whole way through. An example of this is It's A Wonderful Life--classic Christmas movie, but I guess because it's been played over and over on TV so much, I never really sit down to watch it, so I've never seen the whole thing.

What are some books and movies that constantly pervade your life, but that you've never actually taken the time to read or watch in their entirety?