Somewhat cool video I found
 

Not really sure it's anything groundbreaking, but it's cool that they were thinking about this stuff back then

https://www.youtube.com/watch?v=tsvkSmtFDzs

I like that they use a 'tuft on a stick' instead of smoke.

The aluminum dust on the water was a neat demo too.

And then I laughed when they started boasting about the 'streamlined' design of that old car.