I woke up at the knock on the door. There were three knocks at irregular intervals. There was the first one, plain and simple, and then the second, within a fraction of a second, similar to the first one, a bit hurried though; then a long pause. The pause continued to grow intense and longer, almost enough to engulf the previous two sounds. And then it came, bolder and louder. It had a distinct feel to the sound. Panicky and alarming. I waited for the fourth one. By now, I had watch in my hand; counting the time lap, between the last and the one expected. Silence continued, and so does the wait. But didn’t I mention, there were exactly three knocks, the forth never came. I was disappointed. I really wanted to hear the fourth knock, and record the intervals. I could have used this data for building some hypothesis, on knocking and time lap; and its significance to urgency. I was so disappointed that I didn’t feel like checking on the door but then, what about the curiosity buildi...