Farmer

A farmer and his new bride are riding home from their wedding in their horse drawn buggy, On the way , the horse stumbles. The farmer quietly mutters, "that's once". As they ride on the horse stumbles again and the farmer says, "that's twice". And further down the road the horse stumbles again. This time, the farmer gets out of the wagon , goes over to the horse and shoots it dead. When he returns to the wagon, his now hysterical wife says "are you crazy, why did you do that, you must be out of your mind" The farmer replies, "that's once".