A rancher was helping one of his cows give birth, when he noticed his four year old son standing at the fence, wide-eyed and soaking in the whole event.
The rancher thought to himself, "Great, now I'm gonna have to explain the 'birds and the bees'. Well, no need to jump the gun. I'll just let him ask the questions and I'll answer as best I can."
After everything was over, the rancher walked over to his son and said "Well son, do you have any questions?"
Just one," gasped the still wide-eyed lad. "How fast was that calf going when he hit the cow?"