|"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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Mason is the surname of a Muggle family.
Mr and Mrs Mason were in conversation with Vernon, Dudley, and Petunia Dursley when Dobby levitated the cake, which was made by Petunia, and dropped it on Mrs Mason's head. Harry Potter pretended to do this, because they were muggles, and therefore not allowed to know about the existence of magic.