I have heard of, witnessed and been victim of drive by shootings but this is first time I heard of a...rock-by? Well, its obvious that the black magic is working because: (1) Random strangers can waltz up to your house and drop large rocks off but you dont question them nor throw the rock threw the back of their window as they drive off. Next time, run outside and throw the rock threw the guys car I guarantee he wont return. (2) You take the rock into your house? (3) You dont question people who are staring at your house what they are looking for? Its your property you have the full right to protect it and if you die protecting it or if you die protecting your family then this is a very honorable death and its among the deaths of a martyr. Aint nothing here bro, just throw the rock out - daily recite Surah Baqara in your house the whole family can recite different parts of it to facilitate the recitation. If not the entire Surah recite a good poortion of it daily in the house and you are good.