A couple was celebrating their golden wedding anniversary. Their domestic tranquility had long been the talk of the town, and on this special occasion, a local newspaper reporter paid them a visit. He inquired as to the secret of their long and happy marriage. Well, explained the husband, it all goes back to our honeymoon. We visited the Grand Canyon and took a trip down to the bottom of the canyon by pack mule. We hadnt gone too far when my wifes mule stumbled. My wife quietly said Thats once. We proceeded a little farther when the mule stumbled again. Once more my wife quietly spoke: Thats twice. We hadnt gone a half-mile when the mule stumbled a third time. My wife promptly removed a revolver from her purse, hopped down off the beast, and shot the mule dead. I started to protest over her treatment of the mule when she looked at me and quietly said, Thats once.