Simple, Neat, and Wrong soloutions

As pointed out in another thread, for every problem there is a simple, neat, and wrong soloution. Very common example: During sound checks a loud hum or buzzing is heard in the sound system, when checking lights. Immediate response - stop using those dimmer channels - simple, neat, and wrong soloution. Real cause - faulty audio cable or unshielded instrument pickup, usually a known problem that the individual does not want to repair as the sound prblem is easily fixed by not using the dimmer channels that cause the interference. What impact will that have on your show? It would be cheaper for all if the audio cable was repaired. The more expensive solution would be for each venue this cable is taken to, would buy sine wave dimmers. These faulty cables can be detected by having a few dimmer channels up at 50% when they are setting up the sound system, which would give the audio people time to replace the faulty cable, as the interference has not been there in all previous shows. How many other simple, neat, and wrong soloutions are you aware of ?