Ask HN: Happy 404 Day. Whats your favorite 404 error page?

Hacker News Discussion ↗

Creative “page not found” (404) screens are evolving into mini experiences, from cats illustrating HTTP codes and nostalgic retro designs to interactive games, poems, and in-jokes tied to brands or subcultures. Contributors highlight how these pages can soften user frustration, reinforce identity, or even teach concepts like HTTP responses and economics, while also noting common technical pitfalls such as misusing status codes or hiding the fact that the resource genuinely doesn’t exist. Overall, 404 pages are framed as a small but meaningful chance to make the web more playful, memorable, and informative.

Overall theme

  • Thread is a large collection of memorable or clever 404 pages, plus some technical discussion of HTTP status codes and error handling.
  • People value 404s that are entertaining, informative, or on-brand instead of generic “page not found” messages.

Types of favorite 404 pages

  • Brand-aligned visuals: dogs (Amazon), cats for status codes (http.cat), Lego/Pixar/Blizzard/Heinz themed illustrations, Spotify’s “404s and heartbreaks.”
  • Joke or meta-text: Financial Times’ economic “explanations” for missing pages, NPR’s fine-print humor, Wireshark and other pop-culture references, IMDb’s random movie quotes.
  • Minimalist but witty: MIT’s old haiku-style 404, simple text gags like patron-saint-of-lost-things, or deadpan “The requested URL was not found on the server” with attribution as a mock proverb.

Interactive and game-based 404s

  • Puzzle or game elements: slider puzzle (Mercury), Space Invaders and other mini-games, Discord’s hidden snake (via Konami code), Thingiverse’s interactive graphic, Wendy’s and Taco Bell animations.
  • Interactive color or art experiences: color-controlled gallery layouts, random daily art, custom fortune cookies, creative topographic map metaphors.

Storytelling, nostalgic, and retro 404s

  • Long-form microfiction: Adult Swim’s rotating dark stories.
  • Retro aesthetics: 90s-style pages, ZX Spectrum/teletext-like screens, references to defunct MMOs, old-school Flash compilation pages.
  • National or cultural nostalgia: broadcasters’ 404s that mimic legacy TV test cards or local references.

Personal and self-promotional 404s

  • Many commenters share their own 404s: existential monologues, random poetry, interactive boards, search-focused pages, or simple jokes.
  • Some explicitly reuse others’ text or JS and are open about it.

Nostalgia for “lost” 404 pages

  • Several beloved 404s have been removed or changed (old GitHub parallax page, Bloomberg’s monitor-throwing image, Grooveshark panda, old Reddit, Google “xx-hacker” and pirate versions).

Technical discussion of 404 behavior

  • Clarifications that a page can display custom content while still returning HTTP 404.
  • Criticism of APIs that respond with HTTP 200 but encode “404” semantics in JSON.
  • Brief discussion of 204 vs 404, browser behavior (often ignores 204 body), crawler implications, and misuse of status codes (e.g., errors wrapped in 200 by GraphQL).