once, when we were very young and were living in our first home- Meerut we were running short of water. we tried to stick a plastic pipe into the tap and suck it hard. This was a usual practice in those days and it used to work most of the times. However, no matter how hard we tried nothing came out of it, not even a single drop of water. we went to father and told him that. He said "let me try once". he took the pipe in his mouth and took a very strong deep breath and let the pipe out. A strong stream of water came pouring out with such a high pressure that the first few drops of water fell around 1-2 meters away. he was indeed our superman!