The other day, I was power-walking to the subway on my way to the office. Somehow, I found myself behind a 6'4'' giant of a man unable to get past his frame on the narrow pavement. We played musical chairs for a while as my exits were blocked. This went on for two or three minutes. Suddenly, an opening cleared and I slid past him. As I walked away, the gentleman's companion quipped, "Beware of walking trees".