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How about this "kooky" explanation - You work in a office building (this is a safe assumption). You know those drop ceilings? Very, very weak. Sound goes right through em.
If that is shot down, how about this.
You know those drop ceilings and the flourescent lights? Well, depending on the make of the light fixture, there could be transformers and capacitors in the lighting. They click when charging and discharging.
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