I was talking to my step-dad some years ago about the flood and how it was stupid that some think it was the flood that made the grand canyon. He said, "how do you know that Jehovah didn't put Noah and everyone in the ark in suspended animation for a half a million years and that's the way the flood made the grand canyon?"
I thought that my usual reply to something that stupid of, "how do you know the giant noodle spaghetti monster didn't create the whole universe 5 minutes ago?" would have been wasted on him.