https://thebest404pageeverredux.com/
I found this on the forums, awhile back, starting off as a dancing robot as music played in the background, has since change to random gifs and videos.
post here on what you find. good luck and have fun!
(Warning: Contains flashing images and lights! Not for anyone with epilepsy! View at your own risk!)
EDIT: also, here's their steam group (if anyone is curious.):http://steamcommunity.com/groups/thebes ... eeverredux