“And lastly, you must always remember to cover your crystal ball with a dark cloth when it’s not in use.” Hermione uncharacteristically snorted again. “I suppose it’s to keep the spirits from gaining a foothold in the land of the living,” she sarcastically added. Professor Trelawney slowly turned her shawl clad frame to the Gryffindor and gave her a stern look. “It’s because the ball is crystal and if the light hits it just right, the prisms will filter it and burn your house down…” HumourHarry PotterSibyll TrelawneyStupid Hermione Granger Book:The Medium Between Life and Death Source: The Medium Between Life and Death