If anyone tells you that kids in China don't know anything about the Cultural Revolution, show them this.
Most kids don't dress up as Red Guards for graduation – quite a lot go in for cosplay or traditional Chinese costume – but this has been around for a while. It was the bad boy writer Wang Shuo who pointed out back in the nineties that while the Cultural Revolution was indeed a horrible episode, he personally had a lot of fun as a Red Guard. Free food, free travel, an official license to raise hell, every proximate authority figure terrified of you and a good time had by all of the gang.
This sort of thing will clearly continue to appeal, especially since constraints of a different but arguably just as constraining nature still exist today. Here's a recent account of a successful Gaokao factory in Henan:
For senior students, the day begins at 5:30 am and lasts until 10:10 pm, with every hour punctuated by the incessant ringing of bells that announce classes, break times, self-study periods, extracurricular activities and dormitory time.
Here's another institution of the same sort. It wouldn't be hugely surprising if a few students emerged from that kind of setup with a general wish to run amok and a specific urge, to say, lob a few especially annoying teachers out of a window; and the means to express that wish semi-covertly within in a licensed opportunity for a bit of hedonism appear to be to hand.
It just occurred to me that maybe the best film about the Cultural Revolution was If...