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Ralph Mowery

In article ,
says...

You're saying the case is wired to the neutral? That seems very dangerous
because with a two prong plug if you plug it in backwards, now the
case is hot without any fault in the toaster.

Many years ago, say around 1940, some radios with metal cases came with
the case hooked to one side of the AC line. Later the so called 'All
American 5' radios had the chassis connected to one side of the AD
line,but were in plastic cases and everything external was plastic like
the tuning and volume controls.

The plugs were made so you should not be able to plug them in wrong, but
the house could be wired incorrectly.