I really hate this sort of thing. Unless I am certain that the target would really enjoy my meddling, I don't see why my thinking that bothering the property of another is funny makes it OK.
Our car had a few balloons inside, some writing outside, some metal (cans?) dragging in back. It wasn't difficult or time consuming (broken hyphen) to live with, caused no permanent damage, long term (broken hyphen) embarassment, or expense.