'66,
The explanation I've heard is that with the ground prong up there is more chance that something falling on it would be safely deflected (or at least it would have a 50/50
chance of not contacting the ungrounded prong.
I would agree with this in principle, but many plugs are made to plug in with the groung down, and it does look more "normal" that way. I just got back from Kennedy Space Center and all t6he ones I saw "looked like a face".
Bill
