Trainspotting
Liked this movie at first, but didn't understand all the hype around it. After re-watching it with my friend who was watching it for the first time, the comedic bits really shun, but the dark and more serious themes also packed more of a punch I found. If you asked me a month ago, I would argue that this didn't break my top 50, but I think its safe to say it breaks my top 15 now.