My seven year old said he had something to show me. He was sitting at the table with a smooth, blank sheet of paper. He said, "See this paper. When someone says something hurtful to you," he bends the corner of the paper, "it looks like this. Crinkled."  He went on, his demeanor serious, instructional,  "And then the next person hurts you," he begins to wad up the paper, "and it does this to you." He repeated this several times until the paper was a legitimate ball of crinkled mess.