Welding ground...don't do this!

Years ago, I was at a shop where a guy was welding on an OTR truck. Don't remember WHAT he was welding on, but some weld spatter got on a can of penetrating oil under the truck. Yup it stuck to it and burned through the can. Before he knew it, he had a fire and explosion under the truck, because it burned through a fuel hose. Then it got the fuel tank. We had to push the truck off the jack stands with a forklift and push it outside so it wouldn't burn the whole shop down. That truck burned to the GROUND in about ten minutes flat.