In Greek myth, the first woman, made by the gods and given a jar she was told never to open; when she opened it, evils escaped into the world. Chinese says 潘多拉魔盒 for Pandora's box.
Zhè jiàn shì jiù xiàng dǎkāi le Pānduōlā móhé yíyàng.
This matter is like opening Pandora's box.
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Also written 潘朵拉. The 'box' is a slip: Hesiod's Greek has a pithos, a large storage jar, which Erasmus turned into a pyxis, 'box', in 1508. When she shut the lid, only 希望 'hope' stayed inside.