Muxmäuschenstill is a 2004 German black comedy, mockumentary film directed by Marcus Mittermeier, written by Jan Henrik Stahlberg.

Mux's main motivation is an intense desire to bring justice to rapists, thieves, and vandals in his own way, documenting all his actions through a camcorder held by his colleague Gerd, a somewhat simple-minded former long-term unemployed man in his fifties.

Through his accidental involvement in a domestic murder case, he eventually attracts a great deal of media attention, allowing him to expand his operation to a nationwide affair and effectively becoming a crime-fighting entrepreneur.

After a suicide attempt and a hasty burial, Mux hands ownership of his company off to an employee and flees to Italy, taking Gerd with him, as he is a witness to his murder of Kira.

[2] Because a consensus has not been reached, scholars have credited the most logical explanation for why Muxmäuschenstill has showcased black comedy is to highlight a certain point of German society that the film makers think is important to take a closer look at.