We used to throw milkweeds at cars driving by on a nearby road. Just sit out in the field, standup, throw, duck... Messy stuff, those milkweed things.
One day I had one sail into an open window, hit a county deputy in the face, and apparently knocked his cig out of his mouth... I'm guessing it was a cigarette because he STARTED to chase us (about 8 years old) but he turned around and noticed the front seat smoking... We noticed it, too. And ran as fast as our little feetsies would carry us...
Somehow, the guy knew it was me, and was waiting at my house when I got there. I denied up and down that it was me, but everyone knew it was me... He let my parents handle it.
I never did that again. (and by that I mean, we always made sure it wasn't a cop first)...
What is it with cops being there when you're a kid and ready to commit some heinous fun??? Same age as you, we were under a culvert bridge one day and lobbing big sloppy glops of mud up over the edge at a couple of cars going by and wouldn't you know the first one to take a plastering is a Moscow PD car. We spent the whole day on a march of exile to escape that...
A righteous splatter, one of my Northern VA friends was living in Turkey in the 70's and he plastered the windshield of a Soviet diplomats car and got to get chased by pissed off reds :-)