July 21st is...Just... Just what are you thinking about?!An evil day like that does not exist!
In reference to the informally recognized "Masturbation Day", which is derived from the word オナニー (onanii) which means masturbation. The wordplay is as follows: o = 0, na = 7, ni = 2, and i = 1, thus 07/21, though the number 0721 by itself is also the source of many giggles whenever it comes up in Japan.
