Speaking of jack stands, sort of off-topic but I spoke with someone at a trade show a few days ago who told a very chilling story that serves as a warning to those who work under their cars while on stands to be super careful... he was cleaning up the chassis near the engine, and his metal bracelet shorted against the starter. That cranked the engine, causing the car to lurch, fall of the stands, and land on him. Friends got the car off of him, but he required an induced coma and several facial reconstruction surgeries.