Lies! I know how this trick is done.
You look at the socket.
You look at the plug.
Repeat thrice.
THEN put it in, to the amazement of anyone watching.
I mean, I appreciate #CloseUpMagic as much as the next guy, but by now nearly everybody knows this trick.
I'll admit, if the magician puts a subtle mark on the cable so he knows which way it goes ahead of time, possibly even without looking, the illusion can be quite impressive.