wiiwii was building one of the walls of his new house. He picked up a nail, hammered it in; picked up another one, threw it away. He picked up the third nail, hammered it in; picked up another one, threw it away. After this had been going on for some time, he had to throw half of the nails away.
At that moment, ccc came and asked: “What’s wrong with those nails?”
“It’s simple, 村长”, replied wiiwii. “You see, those nails were pointed to the wrong end.”
“I see”, said 村长. After a moment, however, ccc yelled, “You such a fool, wiiwii! Those nails were for the other side of the wall.”