鱼的第八秒是忘记猫的第十命是死亡
[yú de dì bā miăo shì wàng jì māo de dì shí mìng shì sĭ wáng]
'The eighth second for a fish is to forget, and the tenth life of a cat is death.' Here's a mix of two concepts. It refers partly to how fish are believed to have a short attention span of roughly 3 seconds (making it humorous to speak of their experience beyond), and also draws on the mythical notion that cats have nine lives, implying the fateful moment has finally arrived.