This is probably the most visually stunning movie I've ever seen.
Note: FLCL is not a movie, it is a 6 episode series that totals about 2 hours, but it's on letterboxd for some reason.
FLCL is one of my favorite coming-of-age stories of all time. It is intensely weird and powerfully imaginative. It's soundtrack, done by the Japanese rock group The Pillows is one of the best soundtracks of all time.
If you need more justification to watch this show, watch this video.