Early in the morning, I began a drive to Denver from our home in Lafayette. It was cold outside, yes, but there was no snow. I noticed a bit of dirt on my windshield, so I gave it a squirt of windshield fluid and turned on the wipers.
Instantly, my entire windshield was covered with an opaque sheet of ice. Combined with the rising sun, I could see absolutely nothing. And the ice wasn't budging. It looked a little something like this:
Post-crisis assessment has established the culprit: windshield fluid purchased in Florida, which does not require antifreeze properties. I have now filled my reservoir with Colorado-appropriate fluid, and hopefully I won't have another blinding freezeout. Live (if you're lucky) and learn.