These two days on the Internet to see a lot of "doors", are related to students, the basic content is students in the classroom vulgar behavior. The reason why these "doors" have become popular at such a high rate, according to my observation, is due to the disclosure of the "Cixi milk gate" as a trigger. Because some of these incidents did not happen after the milk gate, but went viral after the Milk gate, because the milk gate shifted people's focus to student pornography.
These doors include: Handan University classroom sex door, Cixi vocational high school milk door, Beijing Shunyi pants off door, Shanghai subway hand washing door, Hunan kindergarten teacher bird door, library airplane door, Hunan school swing door.