Quick Way to Reduce Temperature in the Car?

Most of the times, you feel very warm when you get into your car which exposed under sun for long time in the afternoon. So what is the best way to cool it down in the shortest time?

One Japanese professional invented a method. Perhaps it's not an invention. It's just a method. You must watch...

Yes, it looks like an idiot. But, will you do it? I definitely won't.