For a shot of a map blowing away like cocaine, we shot baby powder in 10 minutes to get a good take while sims were going for days #mochat

This discussion on Twitter reminded me when Jim O'hagen was trying to fake blood spreading on a shirt. After a couple of hours of nothing. He got a camera from production and a paper towel. He shot water spreading into the paper towel. With that he had a matte for the effect. It worked great.