"Nothing is improbable until it moves into the past tense.

It is not time for mirth and laughter, the cold, gray dawn of the morning after.
It is not time for mirth and laughter, the cold, gray dawn of the morning after.
It is not time for mirth and laughter, the cold, gray dawn of the morning after.
It is not time for mirth and laughter, the cold, gray dawn of the morning after.