title: jQuery .parent() does not work
body: <p>Why <a href="http://jsfiddle.net/TCZV3/" rel="noreferrer">the following code</a> fails with:</p>
  
  <p><code>Error: class_a_jquery_objects[0].parent is not a function</code></p>
  
  <p>?</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div&gt;
      &lt;div class='a b'&gt;&lt;/div&gt;
      &lt;div class='b c'&gt;&lt;/div&gt;
      &lt;div class='c a'&gt;&lt;/div&gt;
  &lt;/div&gt;    
  &lt;div id='log'&gt;&lt;/div&gt;
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>$(function() {
      var class_a_jquery_objects = $(".a");
  
      $("#log").append(class_a_jquery_objects.length + "&lt;br /&gt;");
      $("#log").append(class_a_jquery_objects[0] + "&lt;br /&gt;");
      $("#log").append(class_a_jquery_objects[0].parent() + "&lt;br /&gt;");
  });
  </code></pre>