This is the story I read from a book:
A wise man was walking with his students. As they passing by a village, a farmer who seemed very worry and distressed, headed towards them.
He stopped then asked the wise man, “Have you seen a kine cows on your way here?”
“No, sorry to say I did not see any.” the wise man answered.
“Sigh, I am the most unlucky person in this world. These cows are the only assets I have and they are all gone missing now. I have been seeking for days yet I couldn’t find them. How am I going to live on without them?” said the farmer sadly.
“…I am really the most unlucky person in this world. Sigh..” he continued to seek for the cows.
The wise man then turned to his students and said, “You are lucky that you do not own any cow.”