|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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A Noisy Hitter is a special kind of Gobstone, which is presumably bewitched to make more noise than usual when it hits other Gobstones. In early 1997, a Slytherin boy stole a Gryffindor girl's Noisy Hitter which had been given to her by her mother on Christmas.