Songfacts®:

• Miike Snow singer Andrew Wyatt is a jealous man, and "the waves" hit his head with thoughts of someone else sleeping in his girlfriend's bed. Wyatt compares himself here to Genghis Khan, and warns her he will react to any romantic rival like the conquering Mongol emperor.
• Here are some Genghis Khan fun facts from The Encyclopedia of Trivia:
  
  The Mongol conqueror Genghis Khan (1162-1227) was born with a blood clot grasped in his fist, a sign that he was destined to become a great leader.
  
  He was so successful in battle, that by the early 1220s the pope in Rome was trembling before the relentless advance of Genghis' "devil horsemen."
  
  His system of law respected the environment by outlawing bathing in rivers and requiring soldiers to pick up their trash.
  
  He conquered in total approximately 4.8 million square miles, more territory than Alexander The Great, Napoleon, or any other leader achieved. By his death Genghis Khan's empire ranged from the Yellow Sea to the Black Sea to North India.
  
  Around 8% of the men in central Asia are descendants of Genghis Khan.