Ausziehn! (2001)

After Norman fails to convince his father, a wealthy industrialist, with his brilliant business idea in the form of a chain of doughnut shops, the hopeful young entrepreneur is given an old tenement house to help him get started. He infiltrates the building incognito and finds a job as the unpopular houseboy. Norman realizes that all is not well with the quirky residents when he finds a dead Santa Claus from last year in the fireplace.