Paragraph- Sent 1: The film opens as Mary Murdock , a young student , leaves a lively party at a club in New Jersey one night .
Sent 2: She hits a bad bump driving home drunk on a dark road .
Sent 3: Later , hearing noises in the garage , she finds a bleeding man , mangled and impaled on her jeep 's bumper .
Sent 4: Not calling 911 , she tries to help , but he suddenly attacks .
Sent 5: Panicked , she hits him with a golf club .
Sent 6: After , she buries his body in a shallow grave in the woods off Clover Rd. .
Sent 7: The next day , Mary covers up the crime ; she scrubs off the blood but does n't get the dent fixed .
Sent 8: Mary starts coming apart .
Sent 9: Irrational , she crashes on a tree to camouflage the small dent with a bigger .
Sent 10: Later the news reveals the missing man is kindergarten teacher Timothy Emser , bipolar and unstable when he vanished .
Sent 11: Strange things occur in Mary 's house , making her feel toyed with by someone unseen ; she descends into paranoia .
Sent 12: It transpires that Rick , her boyfriend , gets involved in the cover up and goes to retrieve incriminatory evidence off the corpse , but is killed , replaced in Emser 's grave .
Sent 13: It becomes clear Emser survived .
Sent 14: Unhinged , he returns to make Mary live through the same nightmare she inflicted on him .
Sent 15: He stalks Mary many ways .
Sent 16: The parrots squawk strange phrases , which alert Mary .
Sent 17: At one point , she falls down the stairs , impaling a screw driver in her thigh .
Sent 18: Emser surprise attacks , biting and stabbing her , and she passes out .
Sent 19: In a reversal , when Mary revives , Emser has strapped her to the bumper with electric cords and Christmas lights and takes her on a sadistic , all-night `` revenge drive '' . 
Question: Why did Emser want a "revenge drive"? 
Incorrect Answer: Because he liked driving.