ANCIENT CHINESE BELIEF ABOUT UMBRELLAS.

The ancient Chinese invented umbrellas. One superstition the ancient Chinese believed about umbrellas is that you can never open your umbrella inside your house. If you do, this will bring bad luck into your house. If someone opened an umbrella, either on purpose or accidentally, the women grabbed their brooms and swept the bad luck out the door immediately!
SOURCE: http://china.mrdonn.org/superstitions.html