Why did Finland's embassy in Australia closing for a day go viral?

Why did the 24-hour closure of Finland's embassy in Australia become so funny online?

Online sleuths shared their "grief" when the embassy, based in the capital Canberra, closed its doors for a routine planning day.

Users rejoiced when the embassy reopened its doors, with the humour enjoyed by the embassy, the leaders of Australia and Finland, and ultimately social media users across the world.

BBC reporter Harry Sekulich explains the viral moment.