It's pretty stupid, but that's Asia and its superstitions for you!
True. My Korean friend told me not to sleep with a fan over night because it can cause a death.
Also at work, we had this Chinese foreigner buying stuff. She paid, I gave her the receipt and a red pen to sign. She was about to sign, and then gave me the pen back. She didn't speak English so I gave her another pen. She gave it back, and all this time I thought it was because the pen didn't work... Turns out, writing your name is red (to Chinese people) means you will "die soon".