Sasuke looked on coldly as her face lost its color, he observed with out a noise as her raspy breathing filled the forest and his ears. "Weak. . ."
-
The Uchiha clan felt no shame in giving young children dangerous objects, primarily weapons, and leaving them alone to experiment. In fact, they encouraged it with enthusiasm (as much as they could muster), and even formed the habit of giving said children presents of dangerous nature. And so it came to be that, one snowy Christmas morning, Uchiha Sasuke received his first kunai.
He loved it. The fact that his brother had given it to him only increased his admiration: for days, all the little Uchiha boy could talk about was that shiny new kunai. He even took it to school and displayed it to the class, before the hysterical teacher had snatched it away and refused to return it until he promised never to bring dangerous weaponry to school again.
He had given his word, albeit sullenly, and slipped the kunai into his pocket. But the whole afternoon was spent fidgeting, his little face pale with longing for the moment the class would be dismissed and he could hold his precious toy again.
-
His lucky kunai stayed with him throughout the years, from Kakashi to Orochimaru to the open road. It was, perhaps, the only object he ever allowed himself to get attached to.
This kunai, the one he knocked his old teammate unconscious with, was the same one he used, years later, to kill her.