If you point your finger at the moon, you would anger the moon, and the deity living on the moon will slice off your ear when you sleep.
The informant is not sure why this is so or who the deity living on the moon is. However, this superstition may be rooted in respecting the deities, and could possibly be linked to the myth of Cháng’é (嫦娥), the Chinese goddess of the moon. She lives on the moon because she had swallowed the elixir of life and became light, floating away from the earth. Her husband Hòu Yì (后羿) was a mortal archer known for shooting down nine of ten suns that were scorching the earth. Cháng’é lives on the moon with a jade rabbit.
It is interesting to note that pointing is disrespectful in cultures all around the world.