Magical objects
Magical Devices and Items Ministry of Magic and the Wizard's Council Muggles

Shrinking Keys

"Just Muggle-baiting. Sell them a key that keeps shrinking to nothing so they can never find it when they need it .... Of course, it's very hard to convict anyone because no Muggle would admit their key keeps shrinking - they'll insist they just keep losing it."
-- Arthur Weasley (CS3)

Shrinking keys are an example of a mundane object enchanted by unscrupulous wizards for “muggle-baiting.” The keys are sold to unsuspecting Muggles, who then can’t find them anywhere (CS3).

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Tags: anti-Muggle sentiment devices laws lost misuse Muggle-baiting rule-breaking rules

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Sources
Chamber of Secrets Chapter 3