Example: Using jQuery DOM Events to Detect a Konami Code
People who grew up playing a lot of video games in the '80s and '90s will have fond memories of the Konami Code (see
http://en.wikipedia.org/wiki/Konami_Code). This cheat code was found in many games written by Konami, and usually gave the player “extra lives” or some other bonus to the game.
Several web sites, such as Facebook and Marvel Comics, have added this code in at various times in their history as April Fools' Day pranks or for other events, enabling some often silly feature until the next page refresh.