6489

The code number that causes you trouble in you're from China, as this refers to Tiananmen Square Massacre date.
This code is censored in Chinese apps and games (like Honkai Star Rail) because of it.
However, you can type "Amayasukado" to refer to that event since it can be written as 3 kanji/hanzi letters that are read as Tiananmen.

I typed 6489 to guess the code and got my Chinese game account locked, damn.

6489 by Shiine-1 May 2, 2026

64 89 

the date where nothing happened on tiananmen squate

zhong xi na:hi bob
bob:hi also do you know what 64 89 means
zhong xi na:yes its the date the tiananmen square massacre happened
xi jin ping:-10000000 social credits
zhong xi na l: *dies*

64 89 by Japanese Symbol for Beginner November 8, 2021