69 is a very funny number. It is often paired with 420 to be even funnier.
Members that commonly use 69:
A VERY funny link was made, it is made by Zaveaxeon. http://69.zave.tech/ (Zavexeon killed the link :( except: http://69.zavexeon.repl.co/ is still up :))
(list is unfinished pls add more)