This is an OLD old story, but I paraphrase it here from one of our favorite"children's" books, Zen Shorts by Jon J. Muth.
"The Farmer's Luck"
There was once an old farmer who had worked his crops for many years.
One day, his horse ran away. Upon hearing the news, his neighbors came to visit.
"Such bad luck, " they said sympathetically.
"Maybe, " the farmer replied.
The next morning the horse returned, bringing with it two other wild horses.
"Such good luck! " the neighbors exclaimed.
"Maybe, " replied the farmer.