Nine at the beginning means

Shock comes–oh, oh!

Then follow laughing words–ha, ha!

Good fortune.

The fear and trembling engendered by shock come to an individual at first in such a way that he sees himself placed at a disadvantage as against others. But this is only transitory. When the ordeal is over, he experiences relief, and thus the very terror he had to endure at the outset brings good fortune in the long run.