Movie Recommendation(s) - Stay Weird

I thought it would be fun to get a list going of 'must-watch' content in the realm of all things weird.  This can be anywhere within the THC spectrum of subject matter.  This can be fiction, non-fiction, fantasy, whatever genre, I am just curious to see what people put forward as some of their 'must-see' content.

Feel free to stay as weird as you want with recommendations, I am open for the journey!