Pencil : You know,I'm really sorry.
Eraser : Sorry for what? You didn't do anything wrong!
Pencil : Well, every time when i make mistake, you will b there to erase my mistake. But, as time pass by, part of u r gone.
Eraser : You see, I'm made to do this. Even though i know one of these day I'll b gone, and u have to replace me with another. I'm still happy to do this job. So don't b sad! It worries me!
This is how true friends supposed to b like... =)))))