Disclaimer: It turns out that his wall charger was wired incorrectly, so mains voltage was wired to the ground of the vehicle, and well the chassis is the vehicle’s ground, hence the voltage. Source. Thanks @WalkingOnEggshells@beehaw.org for the correction.
Wait, this isn’t a broken car, they’re all death traps like this? That’s even worse. A device with a metal chassis should be earthed, not connected to neutral, that’s just an accident waiting to happen.