For want of a Nail the Shoe was lost;
for want of a Shoe the Horse was lost;
and for want of a Horse the Rider was was lost;
being overtaken and slain by the Enemy,
all for want of Care about the Horse-shoe Nail.
- -- Benjamin Franklin, Poor Richard's Almanac, June 1758, The Complete Poor Richards Almanacs, facsimile ed., vol.. 2. 375, 377