A hundred years ago on irc someone from Russia was describing their internet connection, which was ethernet, while I had only ever heard of dial up outside of large companies. It was just people had set up their own hubs and switches in their appartment buildings and strung cables between buildings. This blew my mind. They just ran themselves ethernet and everyone got a drop from a switch in their building. It wasn't…
The fact that all of the above is possible with only a single kind of cable and generic, 'dumb' switches is icing on the (seven-layer) cake.