Mother. It's not that I didn't get the allegory, it was just weird. Also Antichrist, though to be fair, saying "wtf did I just watch" was the whole point of the movie.
I didn't get the allegory in Mother, and I didn't really care. Totally wtf, but I loved how nightmarish it was, and how it looked visually, I was completely enthralled.
Oh yeah, I've read up on the explanation since, but for me it doesn't really add anything. It doesn't take away anything either. I think it was just so captivating I didn't need any meaning. That probably makes me sound far more shallow than I am but hey ho.
Nah, some movies are so visually and mechanical entertaining/enthralling you just sit back and enjoy. The Fountain (2006) was a movie I just didn't care to understand the first watch, it was just so beautiful.