Have you cleaned out your cowl lately?

Years ago my cousin (who was seven, I was 29) and I were in my '68 Coronet 500 wagon, blasting down I-5 at about 70 MPH. Only had been in possession of the car a few weeks and it was just warm enough to let him open the vent on the passenger side. "BA-Whummmmp!" a huge blast of pine needles, 'helicopter' seed pods, and crap just blasted him...lesson learned.