Films ruined by studio interference

Often, when a director directs a film or a screenwriter writes a script, they have their own creative vision for the film. But, sometimes, the people in charge of the studio producing the film (who probably know nothing about the art of filmmaking) will force the director or screenwriter to make changes or even make the changes themselves without the director's/screenwriter's knowledge, effectively destroying their creative vision. The end result is usually terrible, but I guess studios keep doing it because, despite being poorly received, these films often make plenty of money. (If you know a movie that should be on this list or see a movie on this list that shouldn't be, please let me know in the comments below.)