I wanted to put together a showcase of some great 404 pages since there seem to be a lot of hidden gems. Would love feedback and other 404 pages that I haven't seen/found yet if people are willing to share.
I, personally, like the 404 pages with missing kids on it. The only real purpose of the 404 page is to tell the user he messed up somehow; you might as well do some good with it.
Telling the user that "he/she" messed up is the best way to get them to abandon your website.
Clearly explaining that there was a problem, the problem has been sent to the appropriate individual, and guiding them to potential solutions is a better approach.