Murphy's Law Of Windshield-Damage
"You can leave a pitted/abraded/scratched/bubbled/discolored windshield in your car till 0%!$@&# Doomsday and it will never get hit, but then just as soon as you actually REPLACE said "ancient" glass wif a brand new one, THAT'S when you'll get a bleepin' BIG OL' PEBBLE tossed up by a passing vehicle, and star-crack your nice shiny-fresh windshield all to Hell!"
After several years I eventually got sick and tired of all da misty triplex-haze on my car's original-from-the-factory windshield, and so I finally replaced it --- wouldn't you know that the VERY NEXT DAY it got a huge crack in it after a rock got thrown up by the wheel of a passing dump-truck! Ahhhhrrrggggghhhhh... classic case of Murphy's Law Of Windshield-Damage, I guess!!