swearing
Explanation
The Joke
A child asks her father why she cannot say "shit." The father tells her he does not care if she says it, but if his parents hear it, they will be mad at him. We then flash back through generations: the father as a young man says he only told his daughter not to say it because his parents would have been mad. His mother, now elderly, says she would not have cared except she did not want her own mom to hear it. Her father (now very old) declares, "I don't give a fuck about nothin' you say, and I never did."
But then the chain continues further back -- "But if it wasn't you... and it wasn't you... and it wasn't you..." -- tracing the prohibition backward through generations until we reach 8,000 generations ago, where a caveman couple discusses whether "Kranga" would mind if the boy says "shit." They decide to play it safe and say no. The taboo against swearing originated not from any genuine moral objection, but from an ancient chain of people worried about what one specific other person would think.
The Humor
The comic hilariously illustrates how social taboos can persist across millennia without anyone actually caring about the underlying rule. Every single person in the chain is fine with the word "shit" -- they are only enforcing the prohibition because they think someone else cares. It is a perfect illustration of pluralistic ignorance, where everyone privately disagrees with a norm but enforces it because they assume everyone else supports it.
The final punchline -- cavemen deciding to "play safe" about the opinion of "Kranga" -- is funny because it reveals the absurd origin of a taboo that has persisted for thousands of years. The very first instance of the prohibition was not based on conviction but on the same cautious deference that has sustained it ever since. Nobody has ever actually objected to the word; the entire swearing taboo is just an eternal game of passing the buck.
References
The comic illustrates the sociological concept of pluralistic ignorance, a phenomenon where individuals privately reject a norm but go along with it because they mistakenly believe others accept it. This concept was first described by Floyd Allport in 1931 and has been studied extensively in social psychology. The comic also touches on the broader anthropological question of how and why certain words become taboo, a topic explored by linguist Steven Pinker in "The Stuff of Thought" (2007).