Scary Physics

When I plug something in, sometimes I see a small bolt of lightning coming from the electrical outlet or I hear a pop kind of sound. It was kind of scary to see the electricity fly like that, but I know for sure that I am safe as long as I don't touch the metal. The metal conducts the electricity, but the electrons don't travel all around the plug part because the part I hold onto is made out of plastic. Plastic is an insulator, meaning the charge does not move to other regions of the object. If it is a colder day, then I'll see the bolt, but if it's less cold then I'll hear the pop. When it is colder and the humidity is low, objects can retain their charge imbalances longer, so the need to become neutral is greater. The outlet gives the excess electrons happily to my plug.
If I were to touch the metal part of the plug as I put it into the wall, I would get electrocuted as my fingers received the electrons. Depending on the voltage, I would receive a certain amount of joules per one coulomb of electrons, which is 6.25e18 electrons. So if the voltage was 200 volts, then I would receive 200 joules of energy per one coulomb of electrons.
It's kind of hard to see my bolt of electricity in the picture, but it's there.