Behind many smiles there are frowns. Especially if that smile belongs to Bob Ross, a sort of Mister Rogers for adults. His PBS series, The Joy of Painting, taught the art of the 30-minute treescape to millions of American amateurs from 1983 to 1994. A Netflix documentary exploring the battle for Ross’s business empire brings out the never-before-seen dark side of the smiley star. Executive produced by the husband-and-wife Hollywood pair Melissa McCarthy and Ben Falcone, the film also reveals that behind at least one afro there is a perm. —J.V.