The evening wind blew gently again, and the time for gathering passed in a flash... The pictures of the Beihang University students' bed sheet culture exhibition on the campus couldn't help reminding me of my own graduation scene. The same lingering reluctance and 'late disgrace', but the network culture at that time was not as prankish as it is now, nor has it profoundly affected real life so far. The current students have many ways to be playful.