There is something about a singer shattering glass that reminds us of our childhood. How many cartoons have we seen that features an oversized opera singer wearing a horned helmet belting out a note so loud and irritatingly high-pitched that glass shatters everywhere — from windows to cups to glasses? We never considered the validity of these cartoon images. Were these images based on fact or just a funny gag for the audience? Thankfully, there are inquisitive people in this