1. Katie's Possession: Throughout the movie, Katie, Micah's girlfriend, exhibits increasingly strange behavior, leading to the suggestion that she may be possessed by a demonic entity.
2. Micah's Discovery: Micah, using his camera, discovers mysterious symbols and supernatural occurrences when he reviews the captured footage.
3. Micah's Death: In the final sequence of the movie, Katie is seen violently attacking Micah, who's filming the events. The screen becomes distorted and shaky as Micah is overwhelmed and ultimately killed.
4. Ambiguous Fate of Katie: The movie ends with Katie standing over Micah's dead body. It's unclear what happens to her afterward, leaving her fate ambiguous and open to speculation.
5. Unresolved Paranormal Activity: The movie concludes without offering any explanations for the paranormal events or providing closure. This ambiguity adds to the sense of unease and the feeling of unexplained supernatural forces at play.
The ending of Paranormal Activity intentionally leaves many questions unanswered, allowing viewers to form their interpretations and theories about the events that have transpired throughout the film.