Apparently in Korea, electric fans have four settings: low, medium, high, and Murder.
In South Korea there is a superstition that if you leave a fan on overnight while you sleep it could kill you. Colors Magazine reports that “from 2003-2005, twenty deaths were reported due to suffocation caused by leaving fans on while sleeping in a closed space.”
Urban legend enthusiasts and conspiracy theorists have come up with an array of explanations: hyperthermia, hypothermia, or the most likely of the bunch – the fan develops a consciousness and motor skills and attacks you.
But it turns out that in a highly unlikely situation, this can actually happen. Leave a fan on in a very hot enclosed room and it can actually have a convection effect and overheat the body. Highly unlikely but hey, why take the chance? The Shinil company (a manufacturer of electric fans) has even put a warning on their boxes: “This product may cause suffocation.”