>My personal favourite was an box that had door opening detection
>that made the unit apparently fail until 24 hours after the box was
>closed. This was part of a anticlone measure. The most interesting
>door open detections is using an led as a light sensor.

Or the other one that has an input held to ground through a diode such as an 
ordinary 1n4148, which has been carefully fused to go short circuit. Clone 
maker puts good diode in circuit and unit proceeds to behave abnormally. 

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