Place this clip as the immediate reply after the outrageous line in your edit, then follow it with the oh my god wow sound for a second reaction, or close the sequence with nelson's ha-ha when the person doubles down instead of backing off.
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A short 1.6-second voice clip of the phrase 'Are you having a feckin laugh' delivered as a blunt, incredulous challenge. The Irish slang softens the swearing just enough to keep it playful, and the disbelief in the delivery makes it feel funny and confrontational at once, like calling out a joke that has gone completely too far.