A farmer had seven donkeys. He wanted to sell the donkeys on the market. He got the donkeys out of the stable and counted them: "One, two, three, four, five, six, seven." Then he got on a donkey and rode off, the other donkeys ran after.
At the market, the farmer once again counted his donkeys: "One, two, three, four, five, six - there is one missing!" The farmer did not dismount, but counted the donkeys around him once more. There were six donkeys. The farmer said, "I did not count correctly." He counted for the third time, but there were six donkeys.
The farmer was startled and rode home again. His wife should count the donkeys. He said to her, "This morning there were still seven donkeys. Now I only count six. "
The woman laughed: "There are six donkeys around you. You are sitting on the seventh. You yourself are the eighth donkey.