It's a right of passage for a kid to learn what a 120 volt shock feels like if they're careless in unplugging something. One pin is just an unforgettable sensation, while both will knock you down. The real mystery is why code requires the outlets installed upside down. Technology Connections did at least one video on the differences of outlets in the world, and his point was that if the ground pin was above the other two, something falling on a partially exposed plug would rest on the harmless ground and not what it can do, short out the two live pins. But then we wouldn't get the cute faces, so...

Interesting rabbit hole to drill down into …..

I see the Aussie common plug and similarity to other countries. The picture shows partly insulated prongs which is a great safety feature I’ve never seen before

• https://en.m.wikipedia.org/wiki/AC_power_plugs_and_sockets

I don’t know whether it’s physically the same size but that’s 240v and US had similar variations at that voltage

• https://www.bsaelectronics.com/pages/nema-plug-and-outlet-chart

Simple US plugs are also not (usually) reversible. Historically they weren’t but the standard changed decades (half a century?) ago to support polarized plugs with one blade wider than the other. If it matters, such as a light switch, the plug must be polarized and can only fit in one direction. For some things, like a sealed power supply it doesn’t matter

There’s always ancient outlets and ancient plugs that never got replaced but those are getting rare

Nope. So don’t plug a 120V hairdryer or corded drill in those things.

No, voltage adapters are built into basically every electronic device now so it doesn't matter which you plug into