Watch Joaquin Phoenix apparently get caught off guard on Jimmy Kimmel Live after seeing footage of himself on the set of Joker. Phoenix offers a grudging apology to cinematographer Lawrence Sher, ASC, after watching a behind-the-scenes outtake where he berated the DP for “whispering” off-camera during his scenes — and also for comparing Phoenix to Cher during the shoot. (“That was supposed to be private,” he mutters at one point.) The relevant exchange starts at 8:18 into the clip.