"This boy will be famous, a legend. I wouldn't be surprised if today was known as Harry Potter Day in future. There will be books written about Harry; every child in our world will know his name. - Minerva McGonagall. Remember the epic Harry Potter series with this remarkable Harry Potter Harry Morphing Mug. The 11-ounce ceramic mug transforms from black to a vivid full-color image when hot liquid is added, and it weighs 1 pound! Hand wash only. Not dishwasher safe. Do not microwave. Ages 12 and up.