For me it's Fargo. I remember hating it when I say it 20 years ago, but after about a 10 year break I gave it another shot and can't imagine how I ever hated it in the first place. Now one of my favorite movies of all time.
For a little more context, I think when I was a younger person I found myself trying desperately to route for the characters in the film and found myself increasingly frustrated that they all seemed to make worse and worse choices until they descended into little hell's of their own making. I suppose after a decade of exposure to the real world and a fresh set of eyes, I was able to see the movie for what it is. A rather humorous farce that tells the story of terrible people reaping terrible rewards for their terrible motivations. And a damned well told story.
The first time I watched As Above So Below, I hated it. I thought it was cliche and boring and predictable. But it stayed somewhere in my brain for some reason. I watched it again a couple of months later because I couldn't stop thinking about it and I fell in love with it. Its now one of my favorite horror movies and I've seen it 5+ times.
I will check this one out. I love a brain bug.
You definitely should! I also recommend this video as it's the one that made it check it out a second time https://youtu.be/8PsZ46HvtKw