XKCD made me aware of the fact that this sorta joke has been going on since way before any of us were born. 23 skidoo is an old trendy phrase that’s made up of two jokes that mean nothing definable on their own

Today’s 67 is 1899’s 23

From the XKCD alt text:

In 1899, people were walking around shouting `23’ at each other and laughing, and confused reporters were writing articles trving to figure out what it meant.