A heartfelt tale about a dolphin and the humans who cared for it proved no match for Idris Elba at the box office Friday—even if he’s playing a psychotic escaped con out to terrorize Taraji P. Henson. Of course, “No Good Deed” and “Dolphin Tale 2″ aren’t even remotely in competition for the same audience. But in the box office world, for once, adults seem to be forking out more money for their own viewing pleasure.