I feel like everyone has had a movie partially spoiled by a trailer but I also feel like descriptions, movie posters, and even genre tags can be a give away and make a plot twist or scene less impactful.
One movie I vaguely remember watching without any context was the 2021 movie Oxygen. I enjoyed it but I feel like it would have been slightly more predictable if I had looked at the genre tags and that would have effected my enjoyment.
I feel like you need to have a pretty good sense of someone’s tastes to make a “trust me”-style recommendation like this.
20th Century Boys.
Lots of great suggestions below already, thought I’d add The Prestige. Peak Nolan in my opinion, and definitely benefits from going in blind.
All I knew about The Matrix was it had karate, and the slow mo looked cool. I walked out and said “I have no idea what I just watched, but it was amazing.”
Memento
barbarian