As I walked on the sidewalk on 8th Avenue I studiously avoided the ‘doors-in-the-sidewalk by stepping on the vertical edge of each side. The sidewalk was sufficiently crowded that i could not avoid the closed doors altogether. As i thoughtfully avoided the third one, a male voice beside me said ‘Did you see the post of the door that opened?’ i’ laughed and replied that I had indeed read about the man in Brooklyn who was killed by stepping on a closed-door and it open inward, and he fell to his death. “Yes,” he said, ” I thought so.” And then he asked me if I knew that the manhole covers in the street, can blow off unexpectedly due to built up pressure under the road. ‘Great”, I said, “Something else to worry about”.