Here's why:
* Father and Daughter: The film features a father (played by Jim Carrey) who becomes obsessed with a book called "The Number 23." He takes his daughter to the hospital after she is injured, and he sees a number 23 pattern connected to the hospital.
* Cat Scan: The daughter is given a CT scan (sometimes referred to as a "cat scan") which is related to the events that unfold.
* Hospital Disappearance: The story features a series of strange occurrences in the hospital that lead to a feeling of confusion and unreality.
* Mind of a Girl: The ending of the film reveals that the events are all part of a fantasy created by the daughter as a coping mechanism for a traumatic experience.
Let me know if you have any other questions about the movie!