When the large junk truck ahead of you on the interstate suddenly drops large rocks and dirt clods, do as the title of this post says and get outta the way! If you can't, your windshield may look like mine does now.
Thankfully only a few pieces of small glass made it into the car with me but the impact is right at the same height as my head. That's a bit scary, I must say.
Guess who's calling the auto glass guys in the morning?