Developers often neglect the 404 page when they are considering the design of their website. Most 404 pages give visitors a very dull experience - just a simple message of "this page cannot be found." For every rule, there are always exceptions and the case of 404 pages proves to be no different. Most 404 pages just feature an internal server error message, or something similar to that effect. The reality is that a 404 page which isn't neglected is likely to be noticed by potential customers. The trend among web developers is to create a well-designed 404 page which can capture an audience's attention.
Pedro Cortes - Black Hole 404 Page
Many other companies have started to pay attention to their 404 pages. Pixar features an animated character with a message: AWWW...Don't Cry on it's 404 page. Users whom reach Blue Mountain Media's 404 page can find an entertaining game of Pac-Man to keep them busy.
These examples illustrate some of the creativity that designers use when creating new 404 pages. Having a 404 page that you design is a much better customer experience in case your users and visitors happen to reach it. In the best case, they will be more willing to talk about you. For more information click here https://www.reddit.com/r/web_design/comments/a9o5p6/wow_check_out_this_404_page/.