美梦总是让尿憋醒
[mĕi mèng zŏng shì ràng niào biē xĭng]
Literally 'Beautiful dreams always wake you up to pee', which is quite colloquial. It signifies how even beautiful experiences (dreams) could unexpectedly end due to basic, perhaps humorous, human realities, suggesting that life can be interrupted unpredictably by simple necessities.