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(unexpected) incident; unforeseen event; surprising occurrence
happening (performance)
旅先でハプニングが起きた。
A mishap occurred during our trip.
思わぬハプニングに、みんな笑顔になった。
Everyone smiled at the unexpected incident.
テレビ番組で、海外旅行中のハプニング集が放送された。
A compilation of mishaps from overseas trips was broadcast on a TV show.