Real proof of boy's grave fault

When the stern father instructed a young boy to carry the sacrificed goat's leg in pieces to the home diligently and properly, the naive child had to put in a lot of effort. However, he left two cleaned pieces of the legs due to his confusion, which he could not discover was his solemn mistake. 

Later, he eventually brought the leftover parts inside the house after his father berated him for his heavy blunder. This was his carelessness at the moment, too.

This minor or major error causes the boy to lose his utter confidence. His lack of expertise was the reason behind making such an apparent error right away. 

Such an admonition would not have been given at that precise moment if he had not made this sort of error on his first attempt. The fault does not defy the popularly practised principles of careful attention, but the young lad was completely oblivious of it.

The not-so-optimistic boy does not find himself capable of being watchful like a sharp-eyed eagle. It also hinted at the feeling of his careless attitude. He carried the parts that came into his hands. 

What was left, he did not really care, and this made him bear the brunt of the mistake before the people present there. He is not to know everything.

This was indisputable evidence of his mistaken deed, in other words. But – wait for it – the older teenagers were seen laughing at his instant fault at that very crucial moment.