Whack-a-link

whack_a_link.js

// this will look better if you change the page's CSS to:
// .hide {
//   visibility: hidden; }

function randomSeconds() {
  return 10000 * Math.random();
}

function setRespawns() {
  var hiddenlinks = [].slice.call(document.querySelectorAll(".hide"));
  hiddenlinks.forEach(function(link) {
    setTimeout(function() {
      link.classList.remove("hide");
    }, randomSeconds());
  });
}

var links = [].slice.call(document.querySelectorAll("a"));

links.forEach(function(link) {
  link.onclick = function(event) {
    link.classList.add("hide");
    setRespawns();
    event.preventDefault();
  };
});

Playing around in the console. Put all this code in and when you click any link, it'll disappear and then reappear a few seconds later.