American cities are suing car manufacturers over auto theft. They have a case

Tiktok, a Chinese-owned social-media platform where users post short videos, is a fount of useful information. Type “Kia” into its search bar and the helpful autosuggest adds “boys tutorial”. Click through and the most-liked result is a video explaining how to steal a Hyundai car. A gloved hand pulls the plastic off the steering-wheel housing and then jams a screwdriver into the ignition switch and wrenches it aside. Over rap music a computerised voice says: “this is why you should not buy Kia or Hyundai.” The hand attaches a USB cable onto an exposed socket, and twists, and the car starts up. The video has over 415,000 likes. It is one example of a viral internet trend led by “Kia Boys”, adolescents who steal cars to joyride them and post the videos on social media.