Deadly Friend

Deadly Friend is a film released in 1986 directed by Wes Craven. Teen Genius college professor Paul moves into a new neighborhood with his mom and his sentient robot B.B. and soon meets Girl Next Door Samantha (Kristy Swanson) and her abusive father. Things start out great and the kids have a good time, but it's not long before a series of tragedies occur: B.B. is destroyed by the paranoid elderly neighbor lady after they pull a prank on her; Samantha is killed by her father in a drunken rage; Paul decides to bring Samantha back to life by use of a brain transplant using B.B.'s computer chip brain, but the transplant makes her more robot than human and things go downhill from there.

"Tom: ARE YOU OUT OF YOUR FUCKING MIND!!?"
 * Abusive Parents: Sam's dad is of the physical sort and, according to her dream, he may also have sexually abused her.
 * All Just a Dream: Some people's interpretation of the crazy ending.
 * Berserk Button: B.B. is usually the friendly, smart and curious type. So long as you don't harm Paul or anyone it considers it's friend. When Paul puts B.B.'s chip into Sam's brain, she inherits this. It nearly killed a carjacker for breaking into Jeannie's van. Her first victim was her abusive father, whom B.B. suspected of said abuse, just by looking at her bruises. She kills Elvira for stealing Paul's basketball and shooting B.B. When B.B. first encounters a bike gang, it nearly breaks the leader Carl's testicles for hurting Paul.  Tom wasn't safe from B.B./Sam's wrath either. After a crisis of conscience, Tom vows to tell the police what Paul did. They get into a fight and B.B./Sam who was stored in the attic, jumps through the window and brutalizes Tom. Had Paul not stop her, she would have killed him.
 * Came Back Wrong / Cybernetics Eat Your Soul
 * Complete Monster: Sam's dad.
 * Disappeared Dad: Paul's father is absent without any explanation.
 * Executive Meddling: Reportedly a victim of it; Some of the gorier moments were added in late into the film's production by executives to make the film scarier.
 * Girl Next Door: Sam.
 * Killer Robot: B.B. was already starting to show homicidal impulses before his brain was inserted into Sam's.
 * Made of Plasticine
 * Missing Mom: Sam's mother, and according to Sam's dream her father might have murdered her.
 * My God What Have I Done?: Sam/B.B.'s reaction when she almost strangled Paul for slapping her after she attacks Tom.
 * Overprotective Dad: Sam's is of the more deranged sort.
 * Robot Buddy: B.B.
 * Robot Girl: Sam after the transplant.
 * Super Strength: One of the side effects of Sam having a robotic brain.
 * Take Our Word for It: Played With. When Paul explains his plan to save Samantha from brain death. We don't hear exactly what Paul says and the scene cuts to the outside of Tom's house with Tom shouting at him. Subverted as we see exactly what Paul has planned, by transferring B.B.'s chip into Samantha's brain, but we don't see it until after the plan is enacted.


 * Teen Genius: Paul.