Random 5 post

// WP_Query arguments
$args = array(
	'post_type'              => array( 'post' ),
	'nopaging'               => true,
	'posts_per_page'         => '5',
	'orderby'                => 'rand',
);

// The Query
$qtrending = new WP_Query( $args );

// The Loop
if ( $qtrending->have_posts() ) {
	while ( $qtrending->have_posts() ) {
		$qtrending->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();