Mr Rude is one of the later Mr Men characters, created for the long-running British children's franchise about small, personality-driven figures with names that describe how they behave. True to that idea, he is famously impolite, so a moment where he promises music and instead produces a fart fits his character perfectly. Short clips like this have circulated on meme soundboards and in edited videos because the joke needs no context: a grand claim followed by a rude noise is instantly understood, which is why it keeps appearing in reaction edits and prank compilations.
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Mr Rude promises a concert, then lets out a loud fart in this clip from Mr Men. Creators use it as a rude punchline for failed performances and prank edits.
The clip opens with Mr Rude's gruff voice announcing that he will give you a concert, delivered with the character's usual blunt confidence, before it cuts to a long, wet fart sound that completely undercuts the grand promise. The contrast between the formal announcement and the crude noise is the whole joke, making it feel cheeky, childish and instantly recognisable to anyone who grew up with the Mr Men books and show. It lands as a surprise punchline rather than a musical moment, so listeners tend to laugh at the sudden drop in dignity, especially when it follows a serious or boastful setup in a video.