Secret of married life

Here's the untold secret of married life....
A couple was celebrating their golden weddinganniversary. Their domestic tranquility had long been the talk of thetown. What a peaceful &  loving couple".. A local newspaper reporter was inquiring as to the secret of their long and happy marriage.
"Well, it dates back to our honeymoon," explained the man."We visited the Grand Canyon and took a trip down tothe bottom on the canyon by horse. We hadn't gone too far when my wife's horse stumbled. My wife quietly said,'that's once'. " We proceeded a little further and the horsestumbled again.Once more my wife quietly said, 'That's twice.'"We hadn't gone a half-mile when the horse stumbledthe third time. My wife quietly removed a revolver from her purse and shot the horse dead.
"I started an angry protest over her treatment ofthe horse, while I was shouting; she looked at me, and quietly said, 'That's once'.
"And we lived happily ever after."