We left Calis on the 20th october and the nught before, the same thing happened to us. I heard a bang, went out onto the veranda and saw a car just driving off. The pebble hit and cracked a tile just below the window and if it had hit the window, it would have smashed it because it was a large pebble. The fact that the pebble was clean and dry gave me a hint as to what was happening and now that i have read your posting, it just confirms it. Our light was on, the blinds were down and the metal doors were wide open. they probably were hoping that we had gone out and forgotten about them. We are on the Migr's road and in future, we will be doubly vigilant.