"Being a father is like directing Alien or Invasion of the Body Snatchers. It's much more difficult than directing an episode of TV. Also, directing a show or movie lasts a few months at most, parenting lasts for decades."

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Chances are, the aliens will not want to land on our backyard, or even the White House lawn, with their flying saucers. They may have tiny, robotic self-replicating probes which can reach near light speed and can proliferate around the galaxy. So instead of the Enterprise and huge star ships, the aliens might actually send tiny probes to explore the universe. One might land on our lawn and we won't even know.

— Michio Kaku