Best use of Javascript ever!

wave.js

Array.prototype.random = function() {
  return this[Math.floor(Math.random() * this.length)];
}

function wave() {
  var hands = ["\\", "/", "|"];
  var heads = ["o", "O"];
  document.title = hands.random() + heads.random() + hands.random();
};

setInterval(wave, 10);

// Seen on http://raspberry-style.net/