Would you ever walk across a busy intersection with your head down if you didn’t have a smartphone in your hand? If you answered “no,” congratulations, you’re sane. So why is it OK to risk your life just to like your friend’s snarky comment about Gwyneth Paltrow’s see-through dress? Fortunately, some folks are working on litigating some common sense into your brain. Fort Lee, N.J., issued a ban against texting while cross the street, and Nevada has introduced a similar bill.