jQuery UI #8798
http://bugs.jqueryui.com/ticket/8798
HTML
<select title="Cool tooltip">
<option>A</option>
<option>B</option>
<option>C</option>
</select>
CSS
body { padding: 20px; }
JavaScript
$( "select" ).on( "mouseleave", function() {
$( this ).attr( "title", "broken" );
});