In-jokes, including: Leet, The Spanish Inquisition (monty Python), Thx 1138, All Your Base Are Belong To Us, Acme Corporation, Church Of The ... Snipe Hunt, Etaoin Shrdlu, Easter Egg (media)

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More info: An in-joke (also known as an in joke or inside joke) is a joke whose humour is clear only to those people who are "inside" a social group, occupation or other community of common understanding; an esoteric joke. It is humorous only to those who know the situation behind it. Inside jokes may exist within a small social clique, such as a group of friends. They also may extend to an entire profession (e.g., inside jokes in the film/Pro wrestling industry). Inside jokes can sometimes be called a "rib" as that is what they are known in pro wrestling.