Another factor that may enter in to this comes down to Guardian Angels, which is why you cannot win the lottery by simply wishing it to be. Your Guardian Angel is looking after your interests, but they won't go in to contest with other Angels. And seeing as there are many Angels out there carrying wishes from people wanting to win the lottery, all stepping back, the winner is selected by whatever balls come up and nothing more.
This is probably why you cannot wish for a large object to fall on George Bushes' head - because his Guardian Angel is looking out for his interests.
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