North Korea's leader Kim Jong-un has banned the country's citizens from using sarcasm in their everyday conversations.
Satire directed towards the regime and even indirect criticisms of leadership will not be forgiven, sources in the North have said.
Mass meetings organised by central government authorities have been used to issue the warnings.
"One state security official personally organized a meeting to alert local residents to potential 'hostile actions' by internal rebellious elements," a source in Jagang province, which lies along the border with China, told RFA's Korean Service this week.
"The main point of the lecture was 'keep your mouths shut'," the source said, speaking on condition of anonymity.