ArcLight Hollywood recently hosted the Collider FYC screening of Joker, which saw Todd Phillips' longtime cinematographer Lawrence Sher sit down with Jeff Sneider in front of a packed theater. Joker stars Joaquin Phoenix as Arthur Fleck, who lives with his mother (Frances Conroy) in a small New York apartment where, each night, they watch a late night talk show hosted by Murray Franklin (Robert De Niro). When Murray humiliates Arthur one night on live TV, the former clown-turned-comic begins plotting his revenge -- not just against Murray, but anyone who has ever done him wrong. The thing about Joker …