In Shakespeare's towering tragedy, an aging king indulges in a bit of filial vanity that fucks up his entire world. Done right, the ruination of Lear's kingdom is a thrilling thing to behold (evil sisters! Dementia! Dead everyone!), and it's safe to assume that this high-definition broadcast of the National Theatre production—directed by Michael Grandage and starring the great Derek Jacobi—is done right and then some. (SIFF Cinema, 321 Mercer St, www.siff.net, 7:30 pm, $20)