Wear Your Heart On Your Sleeve

Somebody once told me that he was the type of person who wears his heart on his sleeve.  I told him that not only did that sound rather painful and extremely messy, but that I was pretty sure his heart wouldn't function pinned to his arm.  Perhaps he was a serial killer and meant to say that he wears the hearts of his victims on his sleeve.  Either way, some people have very strange fashion senses.