|"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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Rotten eggs are eggs that are in varying states of decomposition, thus rendering them inedible for human consumption. They may be used in some potions. They are kept with the other potion ingredients in the Potions Classroom at Hogwarts School of Witchcraft and Wizardry. Despite their putrid taste, they are also one of more unpleasant tasting flavours of Bertie Bott's Every Flavour Beans.