For the want of a nail, the shoe was lose;
for the want of a shoe the horse was lose; and for the want of a horse the rider was lost, being overtaken and slain by the enemy, all for the want of care about a horseshoe nail.
In sci-fi convention, life-forms that hadn't developed space travel were mere prehistory -- horse-shoe crabs of the cosmic scene -- and something of the humiliation of being stuck on a provincial planet in a galactic backwater has stayed with me ever since.
A farmer travelling with his load Picked up a horseshoe on the road, And nailed if fast to his barn door, That luck might down upon him pour; That every blessing known in life Might crown his homestead and his wife, And never any kind of harm Descend upon his growing farm.
Last Update: January, 2020