The current love for horror movies isn't stopping with 'Obsession'—A24's 'Backrooms' is starting out as a hit in its own right.

'Backrooms' has made $10.4 million at the box office Thursday previews, a record for A24

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…