Unexplained noises, unusual animal behavior and unexplained odors are some signs of alleged paranormal activity. Banging sounds, scratching and footsteps are commonly reported phenomena. They may be loud or subtle.
The sound of doors or cabinets opening and closing repeatedly is also frequently reported, though this may be perceived rather than seen. Pet dogs may suddenly start barking at nothing and refuse to enter a room. Cats stare and appear to watch something unseen. Researchers believe some animals are more attuned to the paranormal than humans. The sudden smell of perfume or other odors in the house is a common sign. The smells usually come and go without any apparent explanation.