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Not the Google Easter egg this, but is very convenient to receive a free material
Its named search “intitle”, basically you search for pages which google doesnt wants that you saw

Print it to google precisely as its shown with inverted commas

“intitle:index” korn mp3

korn – only an example, you can search for that you want
Make sure to change a file extention, to correspond irrespectively a file which you want

That is jpg mp3 txt wma gif and so on

When you receive the results Google Easter egg, they will look little bit various to a regular site
And you should correct click your purpose and choose, “keep communication as”