Movies from the lovely Horrible Reviews comprehensive 3h40m YouTube Video.
Progress: 100% (204/204) complete... yes, I know.

✅ Category 1: The essentials
✅ Category 2: Entry-level
✅ Category 3: Depressing & 'misery porn'
✅ Category 4: True story
✅ Bonus Category 1 - Random
✅ Category 5: Found Footage
✅ Bonus Category 2 - Jörg Buttgereit
✅ Category 6: Quality
✅ Category 7: Gore, shock value & try-hards
✅ Category 8: Animation
✅ Category 9: Asia Extreme
✅ Bonus Category 3 - Random
✅ Category 10: Revenge
✅ Category 11: 70s grindhouse / exploitation
✅ Category 12: Black Comedy
✅ Category 13: Documentary
✅ Bonus Category 4 - Guinea Pig series
✅ Category 14: Japanese lo-fi
✅ Category 15: New French Extremity
✅ Bonus Category 5 - Random
✅ Category 16: Dark, mean-spirited & nihilistic
✅ Category 17: Arthouse & experimental

There are also some additions to the list since this video was released: The Most DISTURBING MOVIES