A philosopher, having made an appointment to dispute with Nasrudin, called and found him away from home. Infuriated, he picked up a peice of chalk and wrote "Stupid Oaf" on Nasrudin's gate.
As soon as he got home and saw this, the Mulla rushed to the philosopher's house. "I had forgotten," he said, "that you were to call. And I apologize for having not been at home. Of course, I remembered the appointment as soon as I saw that you had left your name on my door."