Verified answer

3 Endings

On night 21, Katie awakens to once again stand and stare at Micah while he sleeps. Katie then walks out of the darkness, her shirt bloodied and holding a large kitchen knife, which also appears to be bloody. Katie then sits beside the bed, holding the knife and rocking herself, until about 2 p.m. the next day, when her friend Amber calls and leaves a message expressing her concern. At about 9:20 p.m. that night, Katie is still sitting and rocking by the bed, and Amber can be heard entering the house. During this short period, Katie stops rocking and after Amber sees Micah's body, Amber runs out of the house and Katie resumes rocking. Half an hour later, just after 9:50 p.m., police enter the home and discover Micah's body as well. As they are checking Micah for vital signs, a light turns on in the bedroom down the hallway, but before the police see it the light turns off again. They ascend the stairs and discover Katie, still sitting beside the bed with the knife. As they call to her, she wakes from her catatonic state and seems confused. As she approaches them, knife in hand and calling Micah's name, they ask her to drop the weapon. Suddenly the bedroom door behind the police officers slams shut, startling them, and causing them to shoot Katie, who collapses on the floor. The police then call dispatch and check the bedroom at the end of the hall where they find nothing, except the still running video camera.

In one of them, seen in the theatrical version of the film, after Katie comes out of bed, she stands beside it staring at Micah for approximately two hours and then walks downstairs. After a moment of silence, Katie screams Micah's name, waking Micah who rushes to her. The camera records Katie screaming incessantly, while Micah tries to talk to her when he suddenly lets out a cry of pain. Katie's screaming stops and a brief silence is followed by the sound of heavy footsteps coming up the stairs. After another brief silence, Micah's body is violently hurled at the camera, knocking it over sideways and revealing Katie standing in the doorway. She then slowly walks into the room, her clothing soaked with blood. Crouching over his body, she sniffs Micah (who has evidently been murdered) and then slowly looks up at the camera with a sly smile. As she lunges toward the camera, her face takes on a demonic appearance just as the scene cuts to black. An epilogue text states that Micah's body was discovered by the police on October 11, 2006, and that Katie's whereabouts remain unknown. The film's sequel, Paranormal Activity 2, bases its story on the events of this ending.

The second alternate ending was shown at only one public viewing and was later offered as an alternate ending on the DVD and Blu-ray releases of the film.[14][15] In this ending, Katie gets out of bed and stands staring at Micah, as she did in the original ending, except she does not move to Micah's side of the bed. About three hours pass, then she finally goes downstairs. She lets out a blood-curdling scream, which wakes Micah up and he runs downstairs. The screaming continues, and the sounds of a struggle are heard before the noises abruptly stop. There is silence for a short while before loud footsteps are heard on the stairs. Katie then walks into the bedroom, blood covering her shirt, with a bloody knife in her hand. She closes and locks the bedroom door, then walks up to the camera, standing idle briefly. She then takes the knife and slits her own throat, then falls to the floor.