WordPress, loop over custom meta data of a post

gistfile1.php

  <?php $customKeys = get_post_custom();
	  foreach($customKeys as $key => $value) {
			if(substr($key, 0, 1) !== '_') {
	    ?>
			  <h3><?php echo $key; ?></h3>
				<p><?php echo $value[0]; ?></p>
			<?php
				}
			}
	?>