I had some involvement a few years back on our local emergency response team,this was set up to help deal with the aftermath of fires,we turned out to all kinds but most of it was domestic incidents. I went to one caused by a washing machine,that was actually turned off at the washer but left on at socket,a fault caused a fire wrecking the house as doors were left open,another interesting one occured on a miserable wet day,it was all cloudy except for a band of sun low down in the sky,this was reflected by a shaving mirror on the window sill onto an aerosol can which overheated and exploded wrecking the bathroom.the double adapters were responsible for a lot of electrical fires, not only through overloading but also by the extra weight damaging the contact tubes in the socket leading to arcing.Candles were the main cause of house fires,especially those tea lights,we were shown pictures of a lady who had placed them around her bath and she had added those fancy oils to the water as they do,unfortunately a candle fell into the bath igniting the liquid,believe it or not a lot of the stuff women put in a bath is flammable, the poor lady ended up with severe burns over most of her body.Watch those bath oils and candles.