Indonesia - Whistling

 It is best to avoid whistling at night. Some people believe that whistling at night could attract ghosts. This superstition is more prevalent in villages as people usually stay at home at night.

Russia - Whistling

In Russia, you should avoid whistling at home. It is believed that if you whistle at home, you will frighten the guardian angel who protect your home and you will have difficulties with money.

Mongolia - Whistling

In Mongolia, the nomads live inside a ger. Ger is a Mongolian word for Yurt, a portable felt covered dwelling structure used in the steppes. It is considered bad luck to whistle inside a ger, it is believed that this act will cause a windstorm which can be very dangerous on the steppe. The sound of someone whistling would be easily mistaken as howling winds.