error 418
Error 418 - I'm a teapot was an april fools joke that was made in 1998 & 2014 which was a part of the HTCPCP extension HTCPCP-TEA which was also a part of the april fools joke. Error 418 was eventually gonna get removed but then a movement started named "save 418" saying the internet would be somewhat incomplete without it and it succeded so now error code 418 has become a part of the official web. https://www.google.com/teapot