Think of it this way:
It all started with a tree. Some angry lumberjacks, just being let out of divorce court, are ready to kill some trees. They find a big one in the forest. They chop it down and take it to the factory. At the factory, the tree, still alive, goes through several machines where it is chopped and processed into thin, soft papers. What the factory workers don't know, is that, even though the tree is cut into thousands of little papers, it is still alive. In fact, every tissue is a living individual.
The papers are packaged into dark, small boxes, where the tissues can't see or move an inch. The tissues, despite their extreme uncomfort, will not give up. They all made a vow to all hold hands, and never let go.
However, human hands are much stronger than the hold of the little paper hands. As the little sick boy took a tissue, the tissue's best friend, who was resting below him, went with him, so they would die together. However, the factory workers are smart. They strategically placed a plastic device at the top to impale an individual who tries to pass without the tissue owner's permission.
But to everyone, each of the little tissues are simply trash.