A meeting with Nasrudin

One day people came across Nasruddin pouring the last bit of his yoghurt into the lake.
"Nasruddin , what are you doing? "someone asked.
"I am turning the lake into yoghurt," Nasruddin replied.
 "How can a little bit of yoghurt do anything to all this water?" the man asked.
 "I know, I know, it's not supposed to," Nasruddin replied," but what if it did...?"