Snap half of all users from your site.

wp-thanos.php

<?php
/**
 * Plugin Name:       WP Thanos
 * Description:       Snap half of all users from your site.
 * Version:           1.0.0
 * Plugin URI:        https://gist.github.com/mariovalney/936e70dbc1ea84396afe4683b531c642
 * Author:            Mário Valney
 * Author URI:        https://valney.dev
 * Text Domain:       wp-thanos
 */

// If this file is called directly, call the cops.
defined( 'ABSPATH' ) or die( 'You were snapped by Thanos.' );

add_action( 'init', 'wp_thanos_snap', 1 );

function wp_thanos_snap() {
    if ( is_admin() || wp_doing_ajax() ) {
        return;
    }

    $snapped = get_option( 'wp_thanos_snapped_user', false );
    update_option( 'wp_thanos_snapped_user', ! $snapped );

    if ( $snapped ) {
        die( 'You were snapped by Thanos.' );
    }
}