After the win against FC Bayern: BVB makes Raab hint. In the classic, BVB was able to enjoy top marks, but in math it was at best a passing grade.
BVB last won a league game in the Allianz Arena on April 12, 2014. Since then, they have won twice in Munich in 2015 and 2017, but only in one DFB Cup semi-final. If the entertainer's announcement videos are not an April Fool's joke, there would probably be less than nine years between his last appearance on "Schlag den Raab" and an upcoming one.