Yes, it happens...sometimes people have lapses of judgment.
One night after extensive partying when 20 years old (30 years ago), I whipped out my willy (somewhere in the L.A. Convention Center parking lot) and pissed all over the grill of a Rolls Royce that had just parked.
Despite being a car guy at that time and having been raised to be respectful of others and their property, I had just exercised very poor judgement and deserved to have my ass kicked by the RR owner for it (but luckily didn't 'cause he wasn't around).
Good thing is that piss washes off, does not damage anything other than a car owner's pride, and very likely the only one that would even know is the pisser (unless he is dumb enough to publicly brag about it).
If that happened to my car now, I'd restrain the culprit (if possible) and piss on him as an equalizer.
