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What are your experiences? When did it happen? Has it happened more than once? What causes it? What were the circumstances around the event? Looking for theories.

What are your experiences? When did it happen? Has it happened more than once? What causes it? What were the circumstances around the event? Looking for theories.

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Alarm companies install glass-break detectors. They look like blank boxes mounted to ceilings.

To test them, they have a device that makes a loud sound of glass breaking.