How to Display Random Categories on a Template page?

I've done some searching and I can only pick up:
"display random posts from a category", but I'd like to be able to offer random categories..

How could I do this? Thanks

 

The logic is Put the cat id into array. And random it. Then put the result to wp query.

 

ok cool, how could I do that? I couldn't see any examples on the web...

 

here is the sample. not tested yet
$category_ids = array_rand(get_all_category_ids()); //get all category
$args = array(
'orderby' => 'rand',
'cat' => $category_ids,
'posts_per_page' => '1',
);

$query = new WP_Query( $args);//wp query

//loop the query result
if ( $the_query->have_posts() ) {
echo '<ul>';
while ( $the_query->have_posts() ) {
$the_query->the_post();
echo '<li>' . get_the_title() . '</li>';
}
echo '</ul>';
} else {
// no posts found
}

wp_reset_postdata();

 

its very easy - search for a plugin called "SRP" or "special recent posts". you can configure what to show on the page from which all category or random using a short code.