Mulla Nasrudin

That’s why they bunged it up

   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 they blocked you up, is it? And 
you have not yet learned any sense!’