If you've got a serious craving for a burger, there's more than one reason to satisfy it. Not only is it almost Memorial Day, but May is also National Hamburger Month! To honor the special month, I thought it'd be appropriate to test your knowledge of the oldest hamburger chain in America, White Castle. Creator of the original slider, and the subject of the movie Harold & Kumar Go to White Castle, this fast food chain also boasts a number of fun facts. Can you guess them all? Find out now.