I've tried to watch 2001: A Space Odyssey a number of times. I've always fallen asleep when the spaceships started floating slooowly through space.
Tonight I managed to see more. I actually saw the first half hour without wandering, but then I started zapping. Watching 5 minutes on another channel, then returning to 2001, watching for a while, then zapping again.
I think I have to see it in a movietheatre to be able watch the whole thing. That way I won't be able to zap away or otherwise be (too) distracted.