On Mon, 5 Aug 2019 11:18:22 -0500, dpb wrote:

On 8/5/2019 8:08 AM, Bill Gill wrote:
...

You'll have to work at plugging a 2 prong plug in backward.
The prongs are 2 different widths, so the plug will only
go in one way.
...

That's also a (relatively) recent evolution in the history of the
electric toaster...
I had onwe from the late 40s with a polarized plug - so old it wasn't
a "pop-up"