A mysterious gas is escaping from a hole in the Happy World tanker. Soon, everyone is laughing, but they don't know why. What will happen when the laughter stops? Can Grandpa find a cure for the laughing illness before it's too late?
A mysterious gas is escaping from a hole in the Happy World tanker. Soon, everyone is laughing, but they don't know why. What will happen when the laughter stops? Can Grandpa find a cure for the laughing illness before it's too late?