One day, a doctor of mental hospital saw one of his patients watering a bar of iron.
Seeing this, the doctor just smiled.
A month later, the doctor noticed that the patient still watered the iron. It seemed to the doctor that the patient had treated the iron like a plant. The patient also seemed to love his plant a lot. Therefore, the doctor approached the patient to ask him about the plant.
“How is your plant?” asked the doctor friendly. “Is it growing well?”
The patient gave a weird look to the doctor. Then, he replied, “Are you crazy or what , Doctor? This is not a plant. It is just a bar of iron.”