The rock that I hate

As a geologist, I love most rocks I encounter. But yesterday morning, I went out to my car and saw this: Can you tell what's missing? Hint: here it is, all over the front seats: My car had been broken into over night. Bummer. I live in the city, so this happens sometimes in the city, but I've learned never to leave anything of value in the car, and certainly never to leave anything of value in plain view. The people who broke into my car last night must therefore be classed as vandals, not