Hui Buh: The Castle Ghost is a German fantasy-comedy film released in 2006. The film was directed by Sebastian Niemann and starred Michael Herbig as the voice of Hui Buh. Apart from being a live-action and animation film, the movie also uses computer-generated imagery (CGI) in some scenes.
The story begins with the introduction of the titular character, Hui Buh, who is the officially licensed ghost of Burgeck castle. However, he is not good at his job as he cannot scare anyone. The only person who can see and hear him is the castle's caretaker, Humphrey. One day, King Wedding invites his old friend, Julius, and his daughter, Leonora, to the castle. Hui Buh tries to scare them but fails miserably. In his frustration, he accidentally destroys the license given to him by the king.
To regain his powers and his license, Hui Buh needs to pass a special exam in just two days. The exam is administered by an eccentric professor, who is skeptical of Hui Buh's abilities. The exam consists of several challenges, including scaring modern-day visitors who are immune to the traditional ghostly scares. Hui Buh, Humphrey, Julius, and Leonora work together to help Hui Buh pass the exam and save him from disappearing forever.
The film received mixed reviews from critics, but it was a commercial success. The movie's visual effects and the performance of Michael Herbig were praised. The film's soundtrack, composed by Ralf Wengenmayr, also received critical acclaim. The movie was later released on DVD and Blu-ray and became a cult classic among children and young adults in Germany.