That's Once
The secret to a long marriage:
A couple was celebrating their golden wedding anniversary. Their domestic tranquility had long been the talk of the town. A local reporter asked them about the secret to 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 further and the mule stumbled again. Once more my wife quietly said, 'That's twice.'
We hadn't gone a half-mile when the mule stumbled the third time. My wife quietly removed a revolver from her pocket and shot the mule dead.
I started to protest over her treatment of the mule when she looked at me and quietly said 'That's once'.