再不疯狂我们就开学了
[zài bù fēng kuáng wŏ men jiù kāi xué le]
A call to seize youthful energy before obligations resume. Translated as 'If we don’t go crazy now, we will be back to school'. School represents responsibilities and constraints, so the person encourages oneself and others to live it up, make unforgettable memories and do wild, unconventional things before returning to mundane routines after summer vacations.