Did you ever said something to the friend or your family, but you get an answer that has nothing to do with your question.

Then you will say "incoherent" or "it's not appropriate" .
This event is called "Dissociative".
Dissociative can be interpreted as a dissolution of the relationship between thoughts, feelings, actions and sense of awareness or a person in ongoing situation.

Dissociative are the traits of a person living with multiple personalities.
Things like this often happen. Ever see someone now smile, then he suddenly emotion?

Indirectly they are said to be suffering from DID (Dissociative Identity Disorder) is accompanied by changes in the appearance or emotion.

DID or multiple personality can be defined as a mental disorder where a person who have it would indicate the presence of two or more personalities, each different.

The characteristics of people with DID are:

1. There are two or more distinct identities or consciousness in that person.

2. Personality repeatedly take over the person's behavior (switching).

3. The ability to recall information is very important to remember will be forgotten.

4. Disorders that occur due to psychological effects and substances such as alcohol .

The characteristics of the No. 3, mostly suffering from DID and suffered amnesia when an emerging identity (switching). And when the main personality took over, we could not remember what has been done by the previous identity.

Well, I thought to write this because I often feel some of my friends be weird because my friends was suffering from this.