Doc,

My guess, seeing as how the window is mostly shattered, and not smashed out with $hit missing, is that it is most likely some sort of accident, but the perp didn't man up and leave contact info.

1) If it was personal, they would have likely targeted your eyeFISH back window.

2) If it was to grab something, more window would be missing.

3) I had a friend peel out like a wannabe-bada$$ in the parking lot and his tires threw a rock into the side window of another rig, breaking it damn near exactly like yours. Could be something like that.

... or the neighbor kid got a new pellet gun.