You probably have a ground fault detector plug in your bathroom. It’s an ordinary plug but with a little button in the centre. It prevents you from electrocuting yourself when you drop your electric eyebrow pencil into the water-filled sink.
Strolling along Preston, trying to escape the ever-present thumps of Noisefest, I spotted this unique electrical installation. Judging by the position of the wires, the device must diffuse electricity into the air, to prevent one from being electrocuted when touching the steel tree guard. Pretty clever.
Personally though, I prefer my plugs installed the other way around, so the two slots form eyes and the roundish-one the mouth. I probably took too many children’s stories literally.