You're probably familiar with Easter eggs in popular culture. They are defined as hidden items placed in movies, TV shows, video games, websites, etc., for those who watch closely enough to find them. According to Urban Dictionary, this use of the term originates from The Rocky Horror Picture Show “when the cast had an Easter Egg hunt but most of the eggs went unfound. They can be seen throughout the film in various locations (such as under Frank N. Furter's throne).”
There are apparently Easter eggs all over the Internet as well. Usually, they are hidden links or files coded into software or websites by programmers as jokes.
With Easter around the corner, Sumo Heavy Industries, a digital commerce strategy and execution firm, appropriately compiled some of the best, and most well-hidden Easter eggs on the Internet into a handy little infographic.
One of them involves Miss Piggy; a couple of the most iconic ones can be found on Digg; and a couple of them require the popular Konami Code. My favorite is number 5.
What I think is so great about these Easter eggs, is that if you come across one, you know the company has a sense of humor. Hidden gems such as Apple's reference to Rickrolling (at number 4), shows that they don't take themselves too seriously. It also gives you a peak into the company's culture. These kinds of Easter eggs are a genius marketing tactic.