Discreet Konami Code

dkc.js

function dkc(fn) {
  var kys = [],
    chk = function (event) {
      kys.push(event.keyCode);
      if (kys.length > 11) {
        kys.shift();
      }
      if (3.8384040373937394e+21 === parseInt(kys.join(''), 10)) {
        fn();
      }
    };
  window.addEventListener('keydown', chk);
  return {
    stop: function () { window.removeEventListener('keydown', chk); }
  };
}