Well, there was no warning about this.
Has Nostradamus ever predicted anything correctly, before the fact?
Nostradamus has never predicted anything incorrectly because he deliberately left enough ambiguities in his predictions so scholars could interpret them in a manner that conformed with actual events.
Well, there was no warning about this.
Royal child mortally wounded at tennis (Calvin Coolidge's son)
Storming the gates of San Quentin (formerly puzzling, since the town of San Quentin in France does not have gates, but the prison does)