Electricity
The other day I saw a meme of the Millennials, saying that, as a people, they feared DIY because they were the ones who had survived their parents and grandparents terrifying DIY efforts.
At the time I dismissed this as over-caution, but the discovery last night of the DIY fitted pump under the bath here that would not turn off, leading to alarming smoke, and could not be got at, except by moving far too many large reluctant flat-headed screws and wooden slats, and the further discovery that it was plugged into a three-pin electrical socket located directly under the bath has made me think again.
Maybe these millennials have a point after all.
Still, we got all the screws out, unplugged the pump and the smoke went away after a while! Not entirely sure I want to take another bath directly over an electrical supply though.