a human head?
That's what my passenger thought.
Actually, it was a large diesel engine cylinder head. I was in the middle lane with cars on both sides of me so I had no choice but to straddle it. As I went over the head it hit my oil filter and the gas tank of my car. The guy with me asked "What the hell was that?" and I said a head. He too wondered if it was a human head.
The oil light came on right away and I coasted down an exit ramp into a service station. They put a new oil filter on and repaired the hole in the fuel tank with liquid steel. I expected to be ripped off but the total bill was around 20 dollars!
Being it was the BQE it could have easily been a human head, I suppose.