Brilliant Great Hall O.W.L. Exams
Great Hall, Hogwarts Castle
Fred and George Weasley created this brilliant dragon firework - among many others - for their Weasleys' Wildfire Whiz-bangs line of enchanted fireworks. Tired of then-Headmistress Dolores Umbridge's authoritarian leadership, the twins set their entire stock off inside the castle during their seventh year. This unleashed chaos that continued for hours. It's said that Fred and George received many orders for their fireworks after their display.