Adding my war story for good measure, I've had a rocket fired at me (it missed) up the road from home, happened around 5th Novemeber. Scrotes ran off giggling, sadly it was dark and I didn't get a good look at them, so pointless reporting it. Also had kids armed with a high powered laser pen, and another time water balloons. The trick is to stop. Get off your bike and go ape shoot (King Kong, ape beating chest style), most of the time these kids are cowards and will leg it. It helps that I'm 6'4" and can pull a mean face.
Karma's a bitch, and one day, should these muppets fail to learn how to respect others and continue engaging in risky behaviour, they'll get what is coming to them.
Don't let shoot like this get to you, because for every douche, there's 9 other kind hearted souls out there.