Proves she like some portent of an iceberg Swimming full upon the ship it founders Hungry with huge teeth of splintered crystals?

-Browning, Robert
  Men and Women,'One Word More. To E.B.B.', stanza17.

This is the best portent, to fight in defence of one's country.

-Homer   8c
c.700  BC  Iliad, bk.12, l.243 (translated by Martin Hammond).

Self-parody is the first portent of age.

-McMurtry, LarryJeff
  Some Can Whistle, pt.1, ch.14.