So as it turns out, the butler actually did it! Aunt Matilda had a ball with the somewhat stoic Sherlock Holmes when they got together to solve a mystery in 1879. She bumped into him after a time jump and made it her goal to get him to crack a smile. After her hijinks got him to laugh to the point of tears, he offered her his Sherlock Holmes Cap as thankful nod. He had no idea how nurturing laughter was for the soul!