Footage of Borussia Dortmund’s fans singing their hearts out as Bayern’s fans sat depressingly silent [Vine]

Norwegian football hero Jan Aage Fjortoft was in attendance at the Allainz Arena on Saturday night as Borussia Dortmund trounced Bayern Munich in their own back yard.

Bayern, who have already sown up the Bundesliga title, slumped to their second defeat in three matches as Dortmund crushed Pep Guardiola’s men.

Goals from Henrik Mkhitaryan, Marco Reus and Jonas Hofmann earned Jurgen Klopp’s visitors victory in Munich, and in doing so saw Bayern lose their first home game of the season in the German top flight.

Overall Bayern having one just one match in their last five games, and many will question whether the Bavarians can now turn over Real Madrid in the Champions League semifinal.

Showing just how glum the mood in Munich was on Saturday, Jan Aage Fjortoft uploaded a Vine video showing Dortmund’s fans signing their hearts out in the gods at the Allainz Arena while Bayern’s supporters sat silently in the ground.