Here is a thing that one ought not to do: Sneeze, abruptly, profusely and wetly, while driving to work in the morning. Because the horrifying glob of gross that fires from your mouthparts will hit your windshield at the farthest possible location from your face, and you won’t even find it for a few minutes, and then you’ll notice, and by the time you get to work it will have frozen to the windshield as well as to the dash underneath, and you will discover that cleaning it off with what you have on hand is impossible, and then your car will spend twelve hours outside and you will realize that you are stuck with a smeary blob of gross on your windshield until your car has time to warm up in your garage for a bit before you try to clean again.
The end.