Nasrudin was very thirsty and was happy when he saw by the roadside a water-pipe whose outlet was bunged with a piece of wood. Putting his open mouth near the stopper, he pulled. There was such a rush of water that he was knocked over.
‘Oho!’ roared the Mulla. ‘That’s why the blocked you up, is it? And you have not yet learned any sense!

The Pleasantries of the Incredible Mulla Nasrudin Idries Shah, Octagon Press