|"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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An oven is a Muggle device that cooks food. The Dursley family owned one and the Weasley family owned one when they were using Perkins' tent. The Malfoy family also owned one, as Dobby once said that to punish himself, he had to slam the oven door with his ears between it.