Flying parts
I've seen sparks fly out from behind cars before. Happened to me up at Muncie Dragway with my Chevy II in the mid 80's. When my buddy launched the car, I watched a wad of sparks fly out from under it?
When he pulled up to the trailer, I asked him if anything about the car felt funny. No, says he. I proceeded to crawl all over and under the car. Pulled the valve covers off, found nothing out of the ordinary.
When bad things happen, it can sometimes wake you up. I ripped the pinion gear out of a 9" in one of my old 67 Mustangs in the 70's. Twisted the driveshaft up like a cheap aluminum pop can and busted the floorboard. Even wiith a helmet on, it sounded like a bomb going off inside. We're talking a bone stock 289 with a stick, on 10.5 slicks, wouldn't have thought a car would hook that hard, fooled me!