コナミコマンド ↑ ↑ ↓ ↓ ← → ← → B A

konami.js

if ( window.addEventListener ) {
    var k = [], konami = "38,38,40,40,37,39,37,39,66,65";
    window.addEventListener("keydown", function(e){
        k.push( e.keyCode );
        if ( k.toString().indexOf( konami ) >= 0 ) window.location = "http://www.youtube.com/watch?v=GuIBj0R2ui4";
    }, true);
}