Justin Paul Theroux is an American actor and filmmaker. He gained recognition for his work with director David Lynch in the mystery film Mulholland Drive (2001) and the horror film Inland Empire (2006). He also appeared in films such as Romy and Michele's High School Reunion (1997), American Psycho (2000), Charlie's Angels: Full Throttle (2003), Strangers with Candy (2005), Miami Vice (2006), Wanderlust (2012), The Girl on the Train (2016), The Spy Who Dumped Me (2018), On the Basis of Sex (2018) the voice of Dropkick in Bumblebee (2018), and Lady and the Tramp (2019).

American Psycho is a 2000 satirical psychological horror film directed by Mary Harron, who co-wrote the screenplay with Guinevere Turner. Based on the 1991 novel by Bret Easton Ellis, it stars Christian Bale as Patrick Bateman, a New York City investment banker who leads a double life as a serial killer. Willem Dafoe, Jared Leto, Josh Lucas, Chloë Sevigny, Samantha Mathis, Cara Seymour, Justin Theroux, and Reese Witherspoon appear in supporting roles. The film blends horror and black comedy to satirize 1980s yuppie culture and consumerism, exemplified by Bateman and supporting cast.