And, people tend to have a more… optimistic viewpoint of their future selves. That is, they may be willing to rent, say, an “artsy” movie that won’t show up for a few days, feeling that they’ll be in the mood to watch it a few days (weeks?) in the future, knowing they’re not in the mood immediately. But when the choice is immediate, they deal with their present selves, and that choice can be quite different.
This is a fascinating phenomena, and it happens in many other contexts, not just our movie watching habits. Even if we wouldn’t make the “better choice” today, we tend to have faith that our future self would make the better choice.