In the censored version of film Repo Man, director Alex Cox responded to complaints from the censors about profanity by replacing them with similar sounding phrases. So "motherfucker" is replaced with "Melon Farmer", and fuck with the less offensive flip. Classics apparently include:
The film has apparently become somewhat of a cult classic
because of its ridiculous censorship. However, it also has a serious side as a phrase representative of the absurdity of censorship. http://www.melonfarmers.co.uk/ exists as a site dedicated to the fight against censorship.