A couple was celebrating their golden wedding anniversary.
Their domestic tranquility had long been the talk of the town. 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 to the bottom of the canyon by pack
mule." We hadn't gone too far when my wife's mule stumbled.
My wife quietly said, "that's once."
We proceeded a little farther when the mule stumbled again. Once more my
wife quietly said," That's twice." We hadn't gone a half mile when the
mule stumbled a third time. My wife promptly removed a revolver from her
pocket and shot him.
I started to protest over her treatment of the mule when she looked at me
and quietly said, "That's once."