title: jQuery .prop('checked', false) does not work
body: <p>HTML:</p>
  
  <p></p>
  
  <pre><code>&lt;form class="form"&gt;
      &lt;input type="checkbox" id="box" /&gt; Check Me!
  &lt;/form&gt;
  </code></pre>
  
  <p></p>
  
  <p>JS:</p>
  
  <p></p>
  
  <pre><code>$(window).load(function() {
      var myFunc = function() {
          if($('#box').prop('checked', false)) {
              $('.form').append('&lt;p&gt;Checkbox is not checked.&lt;/p&gt;');
          }
      }
  
      $('#box').on('change', myFunc);
  });
  </code></pre>
  
  <p></p>
  
  <p>Here is a JSFiddle <a href="http://jsfiddle.net/3PYm7/" rel="nofollow noreferrer">http://jsfiddle.net/3PYm7/</a></p>
  
  <p>When I use <code>$('#box').prop('checked', false)</code> as a condition for the <code>if</code> statement it does not work, but <code>! $('#box').prop('checked')</code> works just fine!</p>