Rajesh Randev had been driving for about 15 minutes when he noticed something was off: There was a small crack in his windshield that hadn't been there before. He reached for his phone-charging cable, which was always in the center console. It was missing. Then his phone started buzzing.

Randev pulled over and read his texts. An unknown number had messaged: "Do you drive a Tesla?" Randev did - he was sitting in a white Model 3. He asked who was messaging him.