No kids’ entertainer will creep you out faster than David Friedman, who’s billed as “NYC’s number one birthday clown.” David’s father and youngest brother were the targets of a shocking child-abuse investigation in Great Neck, L.I., in the 1980s. Director Jarecki (who will sit for a postscreening Q&A) had intended to make a documentary about the party-clown circuit, but when David’s past started to emerge during interviews, Jarecki changed his approach—and ended up with this morbidly riveting film.