Knall and Fall as Imposters (German: Knall und Fall als Hochstapler) is a 1952 Austrian-German comedy film directed by Ulrich Bettac and Hubert Marischka and starring Hans Richter, Rudolf Carl and Curd Jürgens.

Two rural men are picked at random for parts in a film production in which they are to play a millionaire and his chauffeur.

After an accident while shooting a scene, the car they are in runs out of control and ends up crashing into a sanatorium.

The director, believing that a real millionaire has arrived at the financially struggling establishment, puts them up.

They are forced for a while to live as imposters until matters are eventually resolved.