A residual haunting, by far the most common type of haunting, is a haunting in which the ghostly energy goes through a cycle of actions - thus repeating itself over and over again.
Typically, these ghostly actions play out at specific times / dates, as though they were following a schedule.
Oftentimes, the event playing out will be that of a tragedy or horrific scene - such as a death or murder. Residual hauntings have been said to be more like a psychic impression of energy - rather than an actual haunting of a physical presence or being.
An intelligent haunting is described as a haunting in which the spirit / ghost demonstrates an intelligence level at which the entity seems to be aware of its surroundings and/or the present-day situation.
These ghosts have been said to actually communicate or interact with the living.
Intelligent hauntings often involve objects being moved and/or other physical activity such as the spirits making sounds / noises, writing on walls / mirrors / etc., slamming doors, and other physical traits such as footsteps appearing from nowhere.
There have been reports of intelligent hauntings where the entities will move things around or even hide objects from their living counterparts. Distinct smells and/or odors are also commonly reported with intelligent hauntings.
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