I was walking down the street the other day when I walked past an alley. Just as I had walked by I heard an “Ouch!” come from out of the alley. I paused, not sure of what I heard and then there came another “Ouch!” I backed up a few steps and turned to look for the source of the noise. I saw an old man facing a building’s brick wall, leaning in toward the wall, forehead against it. He just stood there, not moving, and I did the same. After a few seconds he straightened up, paused, and wacked his head into the wall with another “Ouch!” I was stunned, as I’m sure he might have been too due to the force of the blow. He pasued for another ten seconds and repeated the process once again. “Ouch!” After witnessing this three more times I finally decided to ask the old man why he would be doing duch a thing to himself. I walked up to him and tapped him on the shoulder. “Excuse me, sir. If you don’t mind my asking; why are you banging you head into this brick wall?” The old man turned and looked at me with a puzzeled expression. “Why, I believe the answer to that question is rather obvious.” My look implied that it wasn’t obvious to me. “Well,” he said, “because it feels so good when I stop.”