I no some one who has a split kind of personality his voice is usually very deep,and is a friendly guy but the other day he was crying like hysterically crying, talking to him self, screaming and put on a child like voice, for no apparent reason. he then talks to some one and carrys on in this child like state then walks off turns around n flips straight back to normal, it was like he didnt even no it happened what could this be?