<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

<script src="js/jquery.balloon.js"></script>

    <script>
    $(document).ready(function() {
    $('.sample').balloon({ position: "left" })
    });
    </script>

function enqueue_jquery() {
   wp_enqueue_script('jquery');
}

add_action('wp_enqueue_scripts', 'enqueue_jquery').

wp_enqueue_script('jquery-balloon', get_stylesheet_directory_uri().'/js/jquery.balloon.js', array('jquery'), false, false);

function enqueue_jquery_balloon() {
   wp_enqueue_script('jquery');
   wp_enqueue_script('jquery-balloon', get_stylesheet_directory_uri().'/js/jquery.balloon.js', array('jquery'), false, false);
   wp_enqueue_script('activate-balloon', get_stylesheet_directory_uri().'/js/balloonactivate.js', array('jquery-balloon'), false, false);
}

add_action('wp_enqueue_scripts', 'enqueue_jquery_balloon').