Ryan Coogler's vampire film had an extraordinary second weekend at the box office. It's a victory for a wholly original big-budget film in a cinema landscape of familiar franchises.

When a movie has its second weekend at the box office, the baseline expectation is that ticket sales will drop about 50 percent. If it has particularly strong hype going for it, that drop may be closer to 40 percent,

Ryan Coogler's horror film is on its way to becoming only the fourth horror film ever to gross $200 million in the U.S.