AFI Fest world premieres tend to be so-so affairs, but sometimes you get a gem. Case in point: I quite liked Leave the World Behind, which stars Julia Roberts and Ethan Hawke as a married couple staying in a vacation rental who are accosted by two strangers (Mahershala Ali and Myha'la) who say that nearby New York has been hit by a crippling blackout. Are they to be trusted? That's part of the fun.
