I&#x27;ve been thinking it over.  Dang left an agreement, so the premise is worth reconsidering.  It seems like the problem was that billboards were a remarkably bad example.<p>A better example might be alternative medicine.  It&#x27;s bullshit because it&#x27;s mistaken.  It&#x27;s a negative externality because it costs nothing to imply that it works.  And it&#x27;s harmful because it can kill you.<p>Most cases of bullshit aren&#x27;t as extreme, and I&#x27;m trying to think of some better examples of bullshit that won&#x27;t kill you but will degrade your life.  TV comes to mind.