The annual summer sports day had a long tradition of fancy dress and, eager to impress, the pupils of Sacred Heart Catholic School kept their outfits under wraps for weeks. They wanted to surprise their parents and teachers as they made their entrance at the school in Chiang Mai, northern Thailand.
And surprise them they did. With a flourish and a fanfare, they revealed their costumes - to outraged gasps from the crowd.
The smiling pupils arrived at the school dressed in full Nazi regalia and carrying large Swastika flags, leaving foreign parents and teachers open-mouthed. Leading the march into the sports ground was a girl dressed as Adolf Hitler - complete with toothbrush moustache - seemingly unaware of the offence she had caused. She was followed by a procession of pupils dressed as SS guards - brandishing plastic machine guns.
A teacher at the school said: 'It was all very embarrassing. Traditionally the students wear fancy dress on the summer sports day and they like to keep everything they are preparing quiet. Nobody saw any swastikas around the school before the event.
They left the premises after the school told them no malice had been intended.
Chiang Mai is a popular retirement destination for many Europeans and Americans, some of whom lost relatives to the Nazis.