I'm probably gonna come off sounding like the grinch who stole christmas, but im not bothered, what I really want to know is how does this whole situation work.
I got into my car this evening, coming home from work. My window had salt spray on it as it does every day so I put the window wipers on - force of habit. As it turns out, there was a flyer under my window wiper which by now is soaked in water (from the wiper going up and ripped on my windscreen).
Fortunately it's left the email address in tact. Now aside from the obvious annoyance, I've also heard of others blaming the people who put these flyers on cars of damage to their car (well scratched the paint... I guess from leaning over to put the flyer under??).
What I really want to know is is there anything that specifically states that you must not mess with property that isn't yours? (if that makes sense), while they didn't damage my car (which of course I'm happy about) it would be nice to know. I guess because they aren't actually taking it or damaging it as such, at least not in this case, theres not a lot ("Legally") to say you cant.
I guess it really comes down to common courtesy as to whether you touch someones car thats in a public car park or not.