Put it straight after the swear word as the reaction beat, then follow it with awkward crickets while the speaker looks embarrassed, before cutting back to the scene for the next joke.
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The clip is a brief Swedish spoken line, lasting under four seconds, delivered in a firm, scolding voice: “man får inte svära i skolan,” meaning you must not swear at school. It lands as mock authority, funny because the rebuke is so blunt and school-like, and it turns a slip into a moment of petty discipline that feels familiar to anyone who has been told off in class.