Clinical Psychologists sometimes have their patients use puppets to act out scenes. The idea is that people will be more likely to say what they actually feel, since it's not "them" actually speaking, it's the puppets. (I know this because I watched "What About Bob?" several years ago.) They also sometimes have children draw pictures, again because they are sometimes more willing or able to draw about a traumatic event than they are to talk about it. (I know this because I regularly watch Law & Order: SVU.)
My son recently drew a picture for and about his cousin. I can only assume (based on the details) that communicating with her is somehow psychologically damaging, and that he decided to just treat himself. Click on the pic for full resolution - and make sure you read the text bubbles.