Few box-office indicators are more confounding than the second-weekend drop.
On the one hand, the drop -- the percentage of box-office dollars by which a release falls in its second weekend -- connotes that a film is neither good enough, nor has a fan base deep enough, to sustain itself beyond a strong opening.
On the other hand, to have a big second-weekend drop you sort of need a big opening in the first place. So it can't be all bad.
This past weekend, Zack Snyder's “Batman v Superman: Dawn of Justice” suffered just such a drop, falling from its...