This reminds me of a joke (excuse the adultism).

Three workers are on a construction site, a newbie is with them, from time to time one of the elders yells a number and the others laugh. After a day or two, the newcomer asks: "What about the numbers and the laughing?". He is told, since they work in capitalist accord they have no time to jovially joke around and as such they designed a system of a 1-to-1 mapping of numbers to jokes.

The next day the newcomer wants to pitch in when the situation sounds right and he chooses and arbitrary number and yells it, much to his disdain, the working crew falls silent and scolds him: "That is nothing to joke about, kid!"

Is the 9th type the same, are memes the same as such a list of jokes?