I was just being sarcastic, since that is not how anyone would expect that question to be answered, making it about rocks and physics. The people who ask this question are usually not smart enough to comprehend an answer on this level, they are just being funny. At least that is my expereience.
When I have been asked this question they were not seriously wanting an answer but just to cause problems.
So I answerd like the above people saying that it is impossible for God to lie or do anything contrary to a Holy character, that ended the conversation because they were just making a joke.

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Erick Bohndorf, Covenant Baptist Church, KS
http://qayaqtraveler.blogspot.com/
"Man is retarded by the sluggishness of the flesh, and make's less progress than he ought. The Law acts like a whip to the flesh, urging it on as men do a lazy sluggish ass. Even in the case of a spiritual man, inasmuch as he is still burdened with the weight of the flesh, the Law is a constant stimulus, pricking him forward when he would indulge in sloth."-John Calvin Book II, chapter 7 sec. 12