In computing, Easter Eggs are messages, graphics, sound effects, or an unusual change in program behaviour, that occur in a program in response to some undocumented set of commands, mouse clicks, keystrokes or other similar stimuli intended as a joke or to display program credits.

Easter Eggs in computer games and other video games are distinguished from cheat codes which allow you to cheat. The first known video game to feature an Easter egg was the classic Atari game Adventure, in which a designer's name would be displayed if the player used a certain item in a certain location in the game.

In terms of Homestar Runner toons, Easter Eggs are something extra a user finds that adds to his or her Homestar experience. They include, but are not limited to, pictures that pop up when certain words are clicked during a StrongBadEmail or other Toons or Shorts.

Strong Bad actually covers them in the process. He refers to them when he says, "as I'm typing, you can usually click on certain words and make little pictures of dumb stuff pop up."

To find Easter Eggs, click on the middle of the screen of whatever you are viewing, then hold "Tab" on the left side of your keyboard. A yellow box will highlight anything secret and clickable.