Pandora's box

"Pandora's box" refers to a metaphorical phrase originating from Greek mythology. According to the myth, Pandora was the first woman created by the gods and was given a box as a gift. She was told not to open it, but her curiosity got the better of her, and she unleashed all the evils and miseries of the world upon humanity. Consequently, "opening Pandora's box" has come to represent any action that starts a series of unforeseen complications or brings about chaos and troubles.