I suppose it would count as harassment, but that's because it'd be done to a person. I don't think it's possible to harass a computer program. If we ignore the harassment side of it, then I don't know what law it breaks, if the object can be trivially removed by the driver.
Criminal law - mischief - which generally includes altering of property and isn't limited to damage or destruction of property. Common law - tortious interference - if the vehicle is a taxi being summoned by a customer, and it cannot fulfill the contract because of the interference of a third party intentionally preventing its movement.
"Altering" would have to include a permanent change or anything that's difficult to undo, such as completely repainting the car, or putting it upside down in such a way that it's not damaged. It could not include simply placing a lightweight object on top of the hood that anyone can remove at any time.
Tortious interference, as the name implies, is a matter of civil courts and could open up the person doing it to being sued, depending on the circumstances under which it happens. It doesn't mean they're breaking any laws.
> Tortious interference, as the name implies, is a matter of civil courts and could open up the person doing it to being sued, depending on the circumstances under which it happens.
True.
> It doesn't mean they're breaking any laws.
Yes, it does. Civil law is law (and a larger portion of the law than criminal law is), and torts are as much violations of law as crimes.
Fair enough, but still, the violation arises from the circumstances surrounding the act, not from the act itself. You could very well place a cone on top of someone's car at every available opportunity without running into this tort issue.
> Fair enough, but still, the violation arises from the circumstances surrounding the act, not from the act itself.
That's an arbitrary distinction you could equally apply to any civil or criminal violation of the law; its “the circumstancrs surrounding the act not the act itself” that distinguishes murder from perfectly legal self-defense.
Its the circumstances surrounding picking up an item and walking off with it that distinguish lawful activity from theft.