I was distilling some material yesterday. At the end there was a small amount of tar left that was free flowing at the distillation temperature, and the last volatile material was coming over a drop at a time. I shut off the heat to the oil bath and left, and when I came back sometime later I was greeted with this.
At first it reminded me of Eddie VanHalen's guitar, Frankenstein:
But now I think it looks more like a Jackson Pollock knock-off.