How to display random post with some text

I am trying to find a solution to this problem. I checked some plugins, i found one that is special, because is simple, and seams to function for showing one single rondom post. That is great!
So, i have this function :

function single_random_post() {

		    global $wpdb;
		    $query = "SELECT id, post_title, post_name FROM $wpdb->posts WHERE ((post_status='publish') AND (post_type = 'post') AND ($wpdb->posts.post_password = '')) ORDER BY RAND() LIMIT 1";
		    $randompost = $wpdb->get_results($query);
		    $post = $randompost[0];
		    $post_title = htmlspecialchars(stripslashes($post->post_title));
		    $showpost .= "<a href=\"" . get_permalink($post->id) . "\" title=\"". $post_title ."\">" . $post_title ."</a>\n";
		    echo $showpost;	

}

What i try to do is to resolve my issue. I wanna show some text not just the post title.
Can help me someone with that?