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Fart jokes are one of the lowest forms of humour but the film Blazing Saddles (1974) sought to elevate the humble blow-off to new heights of hilarity. Director Mel Brooks insisted sound engineers increase the volume on the fart noises in the comedy starring the late Gene Wilder. Brooks was annoyed that old westerns showed cowboys eating beans, but never the unpleasant aftermath of what an all-bean diet does to a human colon.
The scene quickly became one the film's most iconic, which posed a problem for some TV stations who bought the rights a few years later: cutting the scene would likely anger fans of the original film, but leaving it in would probably result in offence, they thought. The solution was to show the scene in its entirety while muting every single fart noise.
(Watch the Blazing Saddles fart scene.) (Source: factfiend.com)