The two German rivals are due to meet at the stadium this weekend, with Dortmund currently nine points behind Bundesliga leaders Bayern.
Two disguised commandos and a cameraman manage to gain entry to the Schlauchboot and head straight for a VIP box which they deface by sticking a large Dortmund crest to the wall.
As if that wasn’t enough, the lights illuminating the stadium were then changed from Bayern Munich red to Borussia Dortmund yellow.
Unfortunately, we are unlikely to have just witnessed the perfect crime. Apparently this is an advert for some spray paint.