你什么时候娶我星期八我就娶你
[nĭ shén me shí hòu qŭ wŏ xīng qī bā wŏ jiù qŭ nĭ]
A playful statement where 'Sunday Eighth' obviously doesn't exist implies that the person won't get married easily ('you'll marry me when pigs fly') or teases at a very unlikely condition.