Like quicksand?? a sinkhole?

Mine would have to be, I was chillin with my buddy out front of the gas station we worked at. We had just gotten off work and were almost done with the j and an old VW beetle passes on the road in front of us, trailing a cloud of smoke. At the stoplight, something must have sparked because I noticed thick black smoke starting to blow in front of us and when I looked back at the VW it was spitting smoke from underneath. It quickly got bigger and engulfed the whole car. The driver was already away, so we just sat and smoked another as we watched the inferno. The fire dept came after there was only a burned out hulk of a beetle smoldering in the street.