Large amounts of US currency twisting in the wind
32 years ago, in Chicago, a drug sale turned out to be an undercover police operation. There was a high-speed chase on a highway. The perpetrator, realizing the police cars were closing in, opened his sunroof and release 5000 dollars in small bills into the resulting updraft, in an attempt to cause a traffic jam behind him.
The currency flying in the air was described the following day, by a city newspaper, as a Green Tornado.