Somehow it's the exact same room Joker imagined his mother was in some 30 years ago. While on the show, Arthur makes several misanthropic and morbid jokes. General Information Appearances: Joker kills Murray on live TV in the 2019 movie, written by Todd Phillips & Scott Silver, based on characters by Bob Kane, Bill Finger, and Jerry Robinson. He also admits to killing the three Wayne Enterprises executives on a subway train. A book of jokes.” Joker looks through book.