Plugs are upside down
I'm not an electrician...but I've heard that the "upside down" method isn't really a bad way to go. Reason: if a plug were to be half out of the socket, and something metallic were to fall on it. If it lays across the ground on an upside-down socket, no harm done. If it lays across the two prongs of a right-side up socket, shortsville.
It probably doesn't happen often. If it were me, I wouldn't go to the trouble of flipping them. Of course if an electrician writes in with contrary advice, his/hers should supercede mine.