Beau is Afraid was the last one I recall. I think it was mostly the latter half of the movie where I started to get a bit confused and needed the ending explained to me.
What movies made you look up some kind of explanation afterwards? I feel like I have done it several times in the past for more surreal movies but can’t think of any other examples.
It can also be a TV show.
I mean, it was groundbreaking for its time and it redefined the genre and a lot of moviemaking in general. But yeah, it has severe pacing issues, is undeservedly way too long and it got way too trippy and abstract by the end. Frankly a whole lot of it feels like Kubrick masturbating over how great he is, with a lot of scenes being way too long and serving no real or useful purpose on on the movie.
I could say pretty much the same about Solaris too (the original Tarkovsky version which cinephiles always rave about, not Soderbergh"s, which I actually prefer), and if rumors are true, apparently Kubrick took a lot of ideas from it.