A crack so thin that it could not be seen -
cracked into the windshield of that machine
A flaw that sits awaiting fatal fail -
the crack that pops and groans, yet still unseen
It will happen quickly; with no warning
from that disastrous crack one could not glean
An unforeseen explosion sounds sharply -
the catastrophic snap of cracked windscreen
So much depends on catching that thin gap
cracks become chasms with nothing in-between
So check your scratches and scrub that glass clean
so cracks don't masquerade as scrape or seam