A few years ago there was a big "internet outage" in my country. The people responsible for the national TLD had forgot to put the trailing dot in their zone fi

A few years ago there was a big "internet outage" in my country. The people responsible for the national TLD had forgot to put the trailing dot in their zone file somewhere, meaning lookups of example.tld failed -- but due to how search domains were configured by their servers, example.tld.tld did resolve! Sometimes me and my friends refer to it as "the .tld.tld incident".