title: trigger mouse enter on random element
body: <p>I have this javascript: </p>
  
  <pre><code>$('.foto').filter(function(index) {
      return index == Math.floor(Math.random() * 8) + 1;
  }).trigger('mouseover');
  </code></pre>
  
  <p>I want to simulate a hover effect on a photo, but somehow the filter function does not work.
  I also tried </p>
  
  <pre><code>$('.foto:random').trigger('mouseover');
  </code></pre>