ASK HN: HAPPY 404 DAY. WHAT'S YOUR FAVORITE 404 ERROR PAGE? (HACKER NEWS THREAD)

Summary from the TLDR newsletter

Most of the best and cleverest 404-error pages have been lost to time. This Hacker News thread looks at the current best 404 pages and classic error pages that still survive today. Some examples of sites that have noteworthy 404-error pages include the Financial Times, The Sisters of Mercy, Adult Swim, and Reddit.