Fan death, or the belief that keeping the fan on whilst you sleep in a closed room will kill you, is a widely held belief in South Korea.
Sounds ridiculous, right?
However, top scientists have explained it and confirmed its veracity. There are regular news reports. Every fan in Korea has a timer on it to prevent this lethal threat.
Even Korean wifey has challenged my laughter with documentary X that was on TV.
Talking to my cousin last night, he noted how effing stupid that an entire nation could believe such crap. My reply was essentially, meh, replace “fan death” with “global warming”, and you have an entire planet believing such nonsensical shite … backed up by top scientists and constant news reports, no less.