spur-of-the-moment

In that country at that moment, the Catholics have practically disappeared.
Houellebecq’s Incendiary Novel Imagines France With a Muslim President|Pierre Assouline|January 9, 2015|DAILY BEAST
France 24 is providing live, round-the-clock coverage of both scenes as they progress.
LIVE Coverage of the Paris Terror Attacks||January 9, 2015|DAILY BEAST
Sands was involved in a scandalous-for-the-time romance with the carpenter and there were rumors she was pregnant with his child.
New York’s Most Tragic Ghost Loves Minimalist Swedish Fashion|Nina Strochlic|January 8, 2015|DAILY BEAST
But Krauss said that from the moment he and the other scientists arrived on the island, they never saw anything untoward.
Sleazy Billionaire’s Double Life Featured Beach Parties With Stephen Hawking|M.L. Nestel|January 8, 2015|DAILY BEAST

The massacre of cartoonists at the French magazine Charlie Hebdo is a crystallizing moment.
Why We Stand With Charlie Hebdo—And You Should Too|John Avlon|January 8, 2015|DAILY BEAST
He was too drowsy to hold the thought more than a moment in his mind, much less to reflect upon it.
The Wave|Algernon Blackwood
They are very urgent questions; our sons and daughters will have to begin to deal with them from the moment they leave college.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Her eyes, for a moment, fixed themselves with a horrid conviction of a wide and nameless treachery.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
Sleek finds it far harder work than fortune-making; but he pursues his Will-o'-the-Wisp with untiring energy.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
The thought seemed to produce the dreaded object, for next moment a large hummock appeared right ahead.
The Giant of the North|R.M. Ballantyne

Origin of spur-of-the-moment