If It Bleeds, It Leads<br/><a href='http://tvtropes.org/pmwiki/pmwiki.php/Main/IfItBleedsItLeads' target='_blank' rel='nofollow'>http://tvtropes.org/pmwiki/pmwiki.php/Main/IfItBleedsItLeads</a><br/><br/>What it the grammatical function of "it" and what is it's antecedent?