A doctor came to the mental hospital to visit his patients. In one of the rooms, he saw a man walking around, dragging a toothbrush on a leash.
The doctor asked the man: "What are you doing, walking the dog?"
The man replied: "Oh no, I'm just dragging my toothbrush on a leash."
The doctor left the room amazed, thinking how many normal people end up in mental institutions...
And the man said to his toothbrush: "Ha, Fifi, we tricked him!"