Jack, Iz, and I were walking down Lexington Avenue today. We got to the corner of 39th street and at the red light, a man said, in a very stern voice, "Jackson, sit!" When we turned to find out why some stranger was telling Jack to plant his butt on the sidewalk, we saw a large black dog sitting very nicely. Turns out Jackson the dog was very well trained. As the light changed to green, Jack the person was next up. I said, very loudly, "Jack, stop." He did. So did Jackson the dog and his owner.