function bbp_make_ham_user( $user_id = 0 ) {

	// Use displayed user if it's not yourself
	if ( empty( $user_id ) && bbp_is_single_user() && ! bbp_is_user_home() ) {
		$user_id = bbp_get_displayed_user_id();
	}

	// Bail if no user ID
	if ( empty( $user_id ) ) {
		return false;
	}

	// Bail if user ID is keymaster
	if ( bbp_is_user_keymaster( $user_id ) ) {
		return false;
	}

	// Arm the torpedos
	$bbp_db = bbp_db();

	// Get the blog IDs of the user to mark as spam
	$blogs = get_blogs_of_user( $user_id, true );

	// If user has no blogs, they are a guest on this site
	if ( empty( $blogs ) ) {
		$blogs[ $bbp_db->blogid ] = array();
	}

	// Get array of post types to mark as spam
	$post_types = array( bbp_get_topic_post_type(), bbp_get_reply_post_type() );
	$post_types = "'" . implode( "', '", $post_types ) . "'";

	// Get array of statuses to unmark as spam
	$post_statuses = array( bbp_get_spam_status_id() );
	$post_statuses = "'" . implode( "', '", $post_statuses ) . "'";

	// Loop through blogs and remove their posts
	foreach ( (array) array_keys( $blogs ) as $blog_id ) {

		// Switch to the site ID
		bbp_switch_to_site( $blog_id );

		// Get topics and replies
		$query = $bbp_db->prepare( "SELECT ID FROM {$bbp_db->posts} WHERE post_author = %d AND post_status IN ( {$post_statuses} ) AND post_type IN ( {$post_types} )", $user_id );
		$posts = $bbp_db->get_col( $query );

		// Loop through posts and spam them
		if ( ! empty( $posts ) ) {
			foreach ( $posts as $post_id ) {

				// The routines for topics ang replies are different, so use the
				// correct one based on the post type
				switch ( get_post_type( $post_id ) ) {

					case bbp_get_topic_post_type() :
						bbp_unspam_topic( $post_id );
						break;

					case bbp_get_reply_post_type() :
						bbp_unspam_reply( $post_id );
						break;
				}
			}
		}

		// Switch back to current site
		bbp_restore_current_site();
	}

	// Update topic & reply counts
	bbp_update_user_topic_count( $user_id, bbp_get_user_topic_count_raw( $user_id ) );
	bbp_update_user_reply_count( $user_id, bbp_get_user_reply_count_raw( $user_id ) );

	// Update last posted (to now)
	bbp_update_user_last_posted( $user_id );

	// Success
	return true;
}