Primers make a nice crackle also.
Was that to show Corvair owners what to expect with their Corvairs?At the Corvair conventions, they used to suck up gasoline with Electrolux vacuum cleaners, until they burst into flames. After doing this for many years, it stopped. I don't know if they ran out of vacuum cleaners or that someone figured out that it could be dangerous. Not all rednecks lived in the South.
Was that to show Corvair owners what to expect with their Corvairs?