The list is endless. I've had T&E plastered into the wall where the fool changed the switch to have 2-way switching. No prizes for guessing where he found a spare wire to use. At the old age home I am busy with, everybody was making their way through the low roofspace along the same restricted path trailing their co-ax, cctv, telkom, comms, T&E, surfix and swpvc along the exact pathway. That the cables were of different voltages, lying on top of hotwater pipes, had open joints and being trampled on by everybody else unbelieveably bothered no-one. This actually while restoring after a fire 10 years ago!