A man wandered into a doctor's office and asked to see Dr. George. The receptionist was hesitant to let him in, especially as it was time to close, but he was insistent. The doctor, having completed all his consultations for the day and in a good mood, agreed to see him.
The man entered in a rather aimless manner and, after some hesitation, flopped into a chair and looked nervously around the room.
"How can I help you?" asked the doctor.
"Well, it's like this," said the man. "I keep thinking I'm a moth."
"What? Did you say you think you're a moth?"
"Yes," the man replied. "I'm convinced that I'm a moth."
"Well, I'm very sorry, but you're in the wrong place. What you need is a psychiatrist."
"That's what I've been thinking," replied the man.
"Well, as it happens, I know just the man," said Dr. George. "I'll give him a call and see if he can schedule an appointment for you."
The man agreed, and the doctor made the appointment.
"Tell me," said the doctor, "it must have been apparent from the sign outside that I'm a general practitioner. So if you already know you need to see a psychiatrist, why did you come in?"
"Well," the man said in a resigned voice, "the door was open and the lights were on...."