In-jokes

natural number

natural number

thumb|An "eleet hacker" (31337 H4XØR) laptop sticker, along with a "Free Kevin Mitnick|Kevin" sticker

intentional inside joke, hidden message or image, or secret feature of a work

Internet meme about the poor translation from Japanese to English of a quote from a video game

mental game where the objective is to avoid thinking about The Game itself

code-term that refers to the consumption of cannabis

stock sound effect of a man screaming

1971 film directed by George Lucas

pseudonym used for film directors who do not wish to be credited in a movie production

3D test model

computer Easter egg found in the Netscape and Mozilla series of web browsers

character of a humorous metaphor for highly simplified scientific models of complex real life phenomena

fictional company

protagonist of Minecraft

thumb|upright|A World War II gremlin-themed industrial safety poster A gremlin is a mischievous fictional creature invented at the beginning of the 20th century originally to explain malfunctions in aircraft, and later in other machinery, processes and their operators. Depictions of these creatures vary widely. Stories about them and references to them as the causes of especially inexplicable technical and mental problems of pilots were especially popular during and after World War II.

Herobrine is an urban legend and creepypasta from the sandbox video game Minecraft. He is often depicted as a version of the Minecraft character Steve, but with solid white eyes that lack pupils, and behavior that primarily involves destroying the player's world. The story originated from an anonymous post on 4chan's /v/ board in 2010, where the author reported encountering a strange figure in a single-player world, followed by their messages being deleted when they attempted to talk to other players about the sighting. The story was further popularized after livestreamers Copeland and Patimus

nonsense phrase that contains the 12 most commonly used letters in the English language in order

famous hoax in contemporary Australian folklore

thumb|The door of Room A113 c. 2005 A113 and its variants are an inside joke and Easter egg in media developed by alumni of California Institute of the Arts, referring to the classroom used by graphic design and character animation students.

An in-joke, also known as an inside joke or a private joke, is a joke with humour that is understandable only to members of an in-group; that is, people who are in a particular social group, occupation, or other community of shared interest. It is, therefore, an esoteric joke, only humorous to those who are aware of the circumstances behind it.

humor about mathematics or mathematicians

Internet meme from the video game Portal

fake NHL draft pick

literary device that takes the form of an amusing joke or a comical reference and appears repeatedly throughout a work of literature or other form of storytelling

Wikimedia list article

Whamageddon is a game played during the 24 days before Christmas in which players try to go from 1 December to the end of Christmas Eve (24 December) without hearing the record "Last Christmas" by British pop duo Wham!. Based on the Little Drummer Boy Challenge from the mid-1990s, if the player hears the record between those days, they are out of the game and have to post "#Whamageddon" on social media to indicate that they have lost. Hearing other recordings of "Last Christmas" does not constitute a loss.

subtle representation of cartoon character Mickey Mouse's image

episode of Stargate SG-1 (S5 E12)

REDIRECT Commander Keen#Dopefish

telephone number prefix

A user error is an error made by the human user of a complex system, usually a computer system, in interacting with it; sometimes used jokingly

practical joke in which an unwitting victim is sent in pursuit of something that doesn't exist

Humorous geographical observation

Internet meme

the distinctive, ululating yell of the character Tarzan as portrayed by actor Johnny Weissmuller

Lawsuit filed by political commentator Glenn Beck against Isaac Eiland-Hall

forged plaque allegedly placed by Francis Drake when landing in California in 1579

smoke produced by burning out electronics