The two official Twitter accounts of Denmark and Sweden shocked many followers when they engaged in a lively argument on social media about which country is really the best.
Denmark.dk is managed by the Danish Foreign Ministry and Sweden.se by the Swedish Institute (or according to the latter's profile: “by the communications unit and a moose”).
They usually tweet and retweet various statements that promote their countries.
But on Thursday, something changed.
It all started when Sweden suddenly hit out at Denmark, writing that the country's many lakes are the size of smaller Denmark's entire nation.
But the Danes quickly hit back, mocking their Scandinavian neighbours' famed fondness for rules.