And if it doesn't happen naturally, he'll make it happen.

When the Joker tells you he can "put a smile on your face," I suggest taking the following actions to greatly reduce your chances of becoming a murder statistic:

Tell him -- immediately -- that he can ABSOLUTELY put a smile on your face. And then ask him to tell a joke. And then laugh at it. I mean, really, REALLY laugh at it. 

Appreciating your good humor, the Joker will probably let you live.

If you go the other direction and scream "NO!" while shaking your head in terror, chances are he'll make you smile with a very lethal chemical cocktail. So, my advice? Humor him with every fiber of your being.

Made from 100% cotton, our Joker Can I Put a Smile on Your Face Men's T-Shirt features a maniacal illustration of the Joker's grinning cranium.

And yes, he's telling you he can put a smile on your face. Because he can, one way or another.

Rendered in sickly greens and distressed, anemic yellows, this Joker t-shirt terrifies one into mastering the art of forced laughter.