Ben Hur - All I remembered of this movie from (sort of) seeing it as a kid, was that it was incredibly long. In fact, I recall (sort of) seeing it when I was maybe, 10, and falling asleep several times, only to wake up not entirely sure if I was watching the same movie or not. I always thought I'd seen it in it's entirety, but it's on TV as I write this, and I just realised I've never actually watched it from beginning to end. But I was right: it is incredibly long.
Any movies like this for you?