A farmer and his brand new bride were riding home from the chapel in a
wagon pulled by a team of horses, when the older horse stumbled. The
farmer said, "That's once." A little further along, the poor old horse
stumbled again. The farmer said, "That's twice." After a little, while
the poor old horse stumbled again. The farmer didn't say anything, but
reached under the seat, pulled out a shotgun and shot the horse.  His
brand new bride raised all kind of heck with him, telling him, "That was
an awful thing to do."  The farmer said, "That's once."