In a psychiatric hospital the psychiatrist wanted to test the psychological and mental improvement of the patients and so he drew a motor car on a board. He watched to see what would happen. The patients went to the board and tried to push the car from its position but one of the patients didn't bother to join them, he was sitting calmly without making an attempt to join them in their foolish act. The psychiatrist watched him and felt he is getting better, the psychiatrist then asked him why he didn't join the others. He replied, ''Why should i join them when I have the key to the car?''.