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It was Mrs Gabica's last day teaching at St Julian's Primary School in Newport.
She was on playground duty - but in her 25 years at the school playtime had never turned out like this one did.
The other teachers had plotted a "flashmob" and as they watched through the staff room window the music in the playground started.
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It started as a novel farewell to a much-loved teacher, but little did the pupils know they were actually making an internet sensation.