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"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 burglar alarm is a Muggle device used to detect home invasions. It can be easily defeated by a casting a Freezing Charm upon it, as demonstrated by Horace Slughorn.
Appearances
- Harry Potter and the Half-Blood Prince (Mentioned only)
- Fantastic Beasts and Where to Find Them (film) (First appearance)