Sibling rivalry is a worldwide phenomenon. Yet, it rears its head most worryingly in Scandinavia, literally: siblings forcefully and with malice direct their heads at the rears of their kin. These events are not misguided displays of affection. Rather, they intend to inflict serious pain to the posterior of the receiver (though in most cases result in a nuisance to the noggin of the giver). Brother (say, a chap named Søren) and sister (Sonje, for alliteration’s sake) might go at it for various reasons: the unauthorized “borrowing” of an IKEA gift card, Sonje oversalting the meatballs on her night to cook, or Søren returning the Saab with hardly enough fuel to get to Stockholm, let alone back home.