I have an uncommon last name OG email address. One time, I got someone's rental car reservation. A few months later, I got something from the agency about the car being in a crash. A few months after that, I got an email from a collection agency.

Luckily, I didn't have any issues. I just wrong a short, blunt email saying this is the wrong email address, I have no relationship with this company, and they realized the mistake and left me alone. That said, this was a European rental car company (and a European collector, I assume). The American ones might have been more aggressive.