h a l f b a k e r y
I like this idea, only I think it should be run by the government.
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Smoke alarms of my acquaintance beep intermittently when the
batteries are running down. This is all very well, but what if you're either
deaf or not around when they finally go flat?
Put a riot foam dispenser inside. As the battery runs down, use the
remaining power to hold a nozzle shut with
an electromagnet, but only
deploy this as it runs down to save power. When it finally does fail, the
nozzle opens and quick-drying chartreuse fluorescent foam snakes
spring forth covering the space 'twixt ceiling and floor, thereby alerting
the occupants of the need for a new battery.
||Well detective any Idea what killed the victim ?
||No, but I'll bet their smoke detector battery is dead.
||The chartreuse snakes of fluorescent ejaculate my dear Watt.