Some things just shouldn't be connected to the Internet. With Shodan, a search engine that finds connected devices, it's easy to locate dangerous things that anyone can access without so much as a username or password.
Seriously, there is a car wash on the Internet.
By clicking through the control options, anyone in the world can adjust the chemicals used in the wash and lock someone inside. Or you could be nice and give every customer the works.
Tentler said he has no idea who owns the car wash or where it is. But if you happen to pass through this one, your next wash is on him.