That's Once!
Adam and Eve, a newly married couple, are on their way
on a horse and buggy, to their home on the prairie.
The horse stops to chew grass so Eve says to the horse "that's once."
A few miles further, the horse stops to drink water in a creek.
Eve says to the nag "that's twice."
Half a mile from the homestead, the horse stops to have a breather.
Eve gets the shotgun and shoots the horse dead!!
Adam yells "what have you done? That's our only horse.
I need him to plough the field, pull the buggy, ride to the store, are you mad?"
Eve quietly begins walking away and says "that's once!!"