Jesse Eisenberg’s charming Sundance breakout moves gently and smoothly but hints at an all-consuming darkness underneath. Photo: Searchlight A touching character study anchored by a lively Kieran Culkin performance, Jesse Eisenberg’s A Real Pain moves gently and smoothly but hints at an all-consuming darkness underneath. The film, one of the breakout titles in the early days of this year’s Sundance, was bought by Fox Searchlight immediately after its world premiere, and it’s not hard to see why. The picture’s charming modesty is its great virtue; it’s a light movie with a heavy heart. Structured like a travelogue, A Real Pain...