 The series parodies typical German "squareness".Half-day caretaker "Dieter Krause" is the embodiment of the German "square"; he is pernickety, blindly follows order, denounces others, is nosy, consistently puts his own interests above all else, acts subservient to his superiors and is brutish and unjust to those he deemes below him.Many plot elements — mishaps, misunderstandings, and frequent cases of mistaken identity — originate from Boulevard theatre.