I feel like I should say #spoileralert because the Marvel 404 pages are really quite special.
The one that clued me onto these was discovered by C# developer Iain Miller, who found this Deadpool 404.
When I revisited the site later, I must have missed something because there was a new one! An interactive magnifying glass of Ant-Man
Keep refreshing and more of your Marvel favourites appear - some with funky/creepy effects!