little vandal bastards

Somebody has thrown a rock throught the back window of my car, now I need a new rear window. I am not impressed.
I suppose I should be thankful that they didn't try to steal the car or steal anything in it - although there really isn't anything in my car worth a thing.

So I'm now waiting for the police to come and stare at it and say there's nothing that they can do - just like the last time when the car was broken into really.
Apparently they will hopefully be less than four hours - but since nothing was stolen it only counts as vandalism, so i have to wait.
How bloody annoying is it to have your car windows smashed twice in one year?