My grandmother taught us that we needed to be very careful with electricity. It was dangerous. She unintentionally demonstrated the danger to us by putting a knife into the toaster to remove some stuck bread. The knife flew across across the room and took out a chip of plaster from the wall.
She was very careful to always turn power points off before removing the plug and of course a switch should never be left on if nothing was plugged in.
"The electricity will leak out."
While logic tells me this is not so and for me it is probably more about aesthetics, I can't help but think at times of the electricity slowly oozing from the power point, invisibly charging everything around, including me, with unused electricity.
So should I visit you, don't think I am too odd if I behave strangely near the power points on your walls. I will only be turning unused points off.