One way to get something off your chest is to wear a message on your chest ... or back. Here are photos of T-shirts sighted over several years. For a more serious side, see recent news story, "Did cancer hats go too far?" which pictures T-shirts with the sentiment that got two women kicked out of the King of Prussia Mall.
If you have any photos of messages to share, send them to firstname.lastname@example.org. We've already done two galleries of license plates, with signs and bumper stickers in our plans.