An "Easter egg" is a hidden message or in-joke that software developers will sneak into whatever project they're working on.
There are plenty in OS X and Windows. We even found a few in Firefox.
We've gathered them here for you so you can see the secrets hidden in the software you already have.
Apple's TextEdit icon
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Apple fans will recognize the text on the TextEdit icon, beginning with, "Here's to the crazy ones." They're the words used in a famous Apple commercial.
Emacs psychoanalysis
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Start up Terminal on your Mac. Type "emacs" and hit enter. Quickly press esc + x. Then type "psychoanalyze-pinhead" to see your Mac have a conversation with itself. To stop the scrolling conversation, press ctl + g.
The "suck" effect for minimizing a window
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You can choose between the "scale" or "genie" effect when you minimize a window on your Mac. But there's a secret third choice called "suck."
Start up Terminal and type "defaults write com.apple.dock mineffect -string suck" and restart your computer. The new effect is activated.
See the rest of the story at Business Insider
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