From insane to genius, child to old, anybody can do that. It is a natural phenomenon. All creatures including human beings are ruled by spirits. Spirits always take even very small things into consideration and cause sometimes problems. Spirits are the reason for all thoughts, activities and talks too. They always play game with each other. Sometimes even a small error can provoke anger to a spirit and make a person to behave like that. Certain people can control that spirit but rarely there may be any problem even to them.
Spirits are separate elements. A human being doesn't have a spiritual body. A human being during his/her lifetime is living with many spirits which have joined one by one since birth. They are knowledge, intelligence, skills, feelings, emotions, interests and everything. Even thoughts are not your own. For example, when you want to take a decision on a subject, one after another the spirits think and you just listen, choose or reject the ideas which they transmit to your mind through your brain in the form of thoughts. Brain is just a media to connect the spirits to your mind. A mind is just a computer's mind. After the destruction of a computer completely you will not get it's mind. The same is the case with the human beings. Soul is nothing but an energy needed for the functionality of a body. It is not a spirit or anything else. After death all spirits which accompanied a person quit and go to different places searching new bodies. All human beings are just robots made of flesh and bones and toys of the spirits for their games.