Each Web Server can define an error page for an error code (such as a common 404,500 error).
There is a website that specializes in interesting 404 errors in all sites. It is more than the "adult", "interest", "rude", "friendly", etc., take a few as follows:
Rude: http://www.clint.ca/oops/index.htm http://www.rageboy.com/iq-test.html
Guilt: http://www.dirtdirt.com/nothere.htm http://snap.nlc.dcccd.edu/404.htm
Poetic: http://www.myriadcolours.net/riordon_support-buttons.html http:/mickterry.com/mt404.html http://www.tenletters.com/notfound
Imitation (more fun): http://www.phency.com/404.html http://www.huml.org/404a.cfm http://www.thesistersofmercy.com/error404page.html http: // Www.packetmonkeys.net/qwerty
Card type: http://rc5stats.distributed.net/nothere.htm http://www.gpf-comics.com/nothere.htm http://www.hazardlabs.com/404/index.php
Dynamic: http://www.baker-street.net/404/# ringcycle http://www.13d.org/missing.html
Others: http://www.scythe.net/404/404.html http://allspiritfitness.com/Error.html http://www.greatertles.com/word-number/404error.htm http: // www .arbitraryconstant.co.uk / 404.html (this fun)
Too much, there is no one to open ...