http://bodyodd.nbcnews.com/_news/2012/12/28/16197073-you-can-literally-throw-your-negative-thoughts-away?lite

Take the trash out: According to new research in Psychological Science, writing down your negative thoughts and tossing them in the garbage can erase your bad mood.

Simple pick-me-up or suspect science? The finding seems silly, admits lead researcher Richard Petty, Ph.D., a professor at The Ohio State University. "But sometimes it's the silly things that work."

In one of Petty's experiments, 83 people were asked to write down thoughts on their body image, then either throw them away or keep them. The results: People who kept their thoughts were more likely to side in favor of their notes--so if they wrote negative notes, they rated themselves more negatively--but those who trashed their thoughts saw no change in how they rated their bodies.