Farmer John has three sons. One day his oldest comes to him and pleads with him that now that he is graduating from school he would really like to get a car.
His father says, "Son, come with me!" He takes him to the barn and points to the farm tractor and says, "This tractor is needed for the farm and I promise, as soon as it's paid for, we'll get you a car."
The boy was not too happy but he understood and said, "Ok, Dad." A week later his second son, (10 yr. old), approaches him wanting a new two wheel bike.
Well, he gets the same excuse "....as soon as the tractor is paid for...."
Shortly after that his youngest is bugging him for a tricycle. Again, old dad gives him the lecture about the tractor needing to be paid off first.
While leaving the barn, the young boy, a little disgusted with the whole thing, sees the rooster mating with one of the hens, and promptly goes over and kicks the rooster off the hens back, mumbling to himself. His dad standing near by says, "Son, why would you do something like that? He didn't do anything to you to deserve that."
The little boy says "Hey, nobody rides anything around here until that <snip> tractor is paid off!!!"