Responsibility

what would you feel when you lend your stuffs to your friends, and they lost it? or they return it in less than the perfect condition you gave them..?

well, i would feel angry. and that's exactly what happend to me!
so, yesterday, i lend my friend [he's a boy] my ruler. I've told him to use it properly, but seemed like he didn't hear it. [i think he's deaf].