Move over, Mariah Carey! There's a new Christmas carol that could go down down in history...and stay there. John Mayer recently debuted a new heartfelt holiday tune he affectionately titled, "CVS Bag." And I think to many, it will perfectly encapsulate the feelings we have at this time of the year, especially when you're a guest in someone's house. John debuted the video on his Instagram page, while displaying the contents of his own "CVS Bag."