This is the first time I've heard of this (probably because the advancement of technology) but I thought it was quite funny how confusing it could get.
Wiki
LOL!
Wiki
many early "stealth" radar detectors were equipped with a radar-detector-detector-detector circuit, which shuts down the main radar receiver when the detector-detector's signal is sensed,
LOL!
the development of the radar-detector-detector-detector-detector-detector was deemed necessary