Plot:  “All it takes is one bad day.”  That’s the premise behind director Sam Liu’s animated film Batman: The Killing Joke.  Based on the seminal 1988 graphic novel by writer Alan Moore, The Killing Joke follows the exploits of adversaries Batman (Kevin Conroy) and The Joker (Mark Hamill).  After The Joker shoots Barbara Gordon (Tara Strong) and kidnaps Commissioner James Gordon (Ray Wise), he…