Parents need to know that The Butterfly Effect is a 2004 sci-fi thriller in which Ashton Kutcher plays a college student who can relive the past and attempt to change it for the better. The movie doesn't shy away from traumatic events and dark subject matter. There are scenes involving child molestation, prison rape, animal cruelty (a dog tied up inside a sack and set on fire and killed), accidental murder, suicide, drug addiction, mental illness, and prostitution. One the characters is beaten to death with a baseball bat. In another scene, one tween kills another tween by stabbing him with a large piece of scrap metal. While serving time in prison, the lead character, on the verge of performing oral sex on two inmates, stabs them both in the groin. It has male and female nudity, talk of sex, and sex acts; a college student tends to walk into his dorm room while his roommate is having sex with his girlfriend. Adults, tweens, and children frequently curse, including "f--k." Homophobic and racial slurs are used. This fearlessness in terms of not shying away from subject matter that is difficult and troubling sometimes overshadows the deeper points the movie is trying to make about "the butterfly effect," "chaos theory," and how events and decisions large and small can play huge roles in determining the kind of people individuals turn out to be.