Just as quickly as this spontaneous embrace of mother and son began, Leo had had enough and darted back inside.

For Clark, the game’s appeal is the spontaneous encounters with strangers that pool invites.

The making of “Nickel Boys” required a similar balancing act: meticulous technical artifice to deliver a seemingly spontaneous lyricism.

The judge, Lord Armstrong, told him: "It was not a spontaneous event which happened on the spur of the moment, it was in effect an execution."

But the ensuing organic and spontaneous outpouring of populist anger underscored how many Americans have been cruelly and unjustly denied medical treatment.