If you're looking for a cool Dark Knight inspired t-shirt, TeeFury has one on sale today. Designed by artist Lee Crutchley, the shirt is called Heath and it uses the Joker's famous line "Why So Serious" in a clever way. Like all TeeFury t-shirts, it's $9 dollars and only for sale for 24 hours. That means at midnight tonight, they stop selling it. More images after the jump: