Backrooms shattered A24's record. Obsession beat Star Wars. Two Sleepy People sold to mk2. Three films from YouTube creators just remade the box office.

If you're a young movie director, you get your start on YouTube. Next: graduating to movie theaters, and crushing the competition.

YouTube filmmakers are ascendant, with 'Obsession' topping the second weekend of 'Mandalorian and Grogu' and becoming the first film in more than 40 years to increase in both its…