Quoth the server

[lost1ntwilight]

I noticed that today's XKCD is # 405, and the last one was 403. I thought the author must have made a mistake on the link, so I typed in this:
http://xkcd.com/404/

and got a 404 error.

I like this guy's sense of humor. ;)

Comments

[mechagojira]

Ha! nice catch. :)

[elucidar]

It's funny when it's intentional...

[minion82]

lol

[cryptor_00]

very nice