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I've been discussing about humour and how things become funny for people with a friend, and we got stuck at this point. What is the process behind laughing at inside jokes? They don't necessarily break expectation, use sarcasm/irony nor are surreal.
We have no experience in psychology, but this seemed like the best place to ask.
Check out the two articles below:
Two of the functions unite communicators through identification and clarification of norms, while two other functions divide communicators through differentiation of unacceptable behaviors and enforcement of norms. "Inside jokes" unite communicators.
They posited that humor acts as a high-accuracy signal of shared but tacit background knowledge, including social norms. To “get” a joke requires understanding tacit knowledge assumed by the joker, and “getting” a joke virtually guarantees shared tacit knowledge. "Inside jokes" signal you're on the inside.
