Examples:
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Literature
- Vainqueur the Dragon: From "Landfall":
ERROR 404: Soul not found!
Live-Action TV
- Kamen Rider Zero-One: The theme song, "REALxEYEZ", includes the lyric "Kotae wa (The answer is) 404 Not Found." The extended version of the song from the soundtrack also mentions a lesser known error in the second verse, "Mayoeba (Once you're lost, it's) 408 Timeout."
Music
- The Boastful Rapper performing "Java Life"
brags about not having "seen the 404" in over ten years.
Video Games
- BoxxyQuest: The Shifted Spires: The 404 Orb, a reference to the "404 Not Found" Error Code... broke the Internet when tossed into its core, instead of destroying it as its user intended.
- In the Steam port of the original Bullet Hell Monday, after beating the Final Boss on Normal or higher, the game freezes, and then flashes an "ERROR — CODE: BHM403" message, as in a "403 Forbidden — You don't have permission to access this asset" — effectively forbidding the player from moving to a "game cleared" state. The game then summons the True Final Boss. Additionally, point-based extra lives are disabled for this fight, represented by the "points until next extend" gadget being replaced with "BHM 503 EXTEND UNAVAILABLE", as in "503 Unavailable — the service is unavailable at this time."
- Deus Ex: Human Revolution, at the Picus Office, Jensen tries to track Eliza Cassan (whom, unknown to him, is an AI). The first room he's lead to check is room 404. Unsurprisingly, he fails to actually find her there (finding only a hologram of her).
- Devil Survivor 2 ends its Game Over message with 403 Forbidden. The message often appears when a website's code is being rewritten. In the context of the game, the world is being altered. Its Updated Re-release Record Breaker goes for 404 Not Found instead, to signify the world being destroyed.
- Epic Battle Fantasy 5: Using a Limit Break that shows Earth in its animation after the Devourer's deleted the world will instead show the animation with Earth replaced with a black circle with a red outline and "ERROR 404: NOT FOUND" in red.
- Girls' Frontline: One of the more prominent squads featured in the game's story is called "404", presumably named for their status as a small, clandestine, independent black ops squad who wipes the memory of their clients after every mission. Even the main characters are no exception to this treatment.
- The Impossible Quiz Book: After wiping the Impossible Quiz from history and ending the game, you're shown the message "Error 404 "The Impossible Quiz.swf" could not be found".
- Incremental Mass Rewritten: After performing a Quantum for the first time, you are told mass has been vaporized and are shown a screen that shows a broken picture of it and a 404 error.
- Skullgirls has plenty of lines for combo ratings. 403 has "Forbidden" and 404 has "Not Found".
- Super Paper Mario: One of the lines Fracktail says after being corrupted is "404 computer hamsters not found".
- Science Girls!: For both 403 and 404:
- Classroom 403 has a blackboard that says: Entrance Forbidden - This means you".
- If classroom 404 is entered while Missy is in the party, as the Science Club member who's focus is Computers, she says:
404 monster not found!
Web Original
- There's a Flickr gallery called HTTP Status Cats. It contains a lot of cat memes with one for each code.
- Neopets puns on the error in one of the games on their website, as a location in NeoQuest II is the lost city of Phorofor.
