Back in college, inspired by this photo, I shot up a carton of beer with a BB gun. It was in the film days, so I couldn't just check the screen to see how I did. And I didn't have any sort of shutter trip. Trigger in one hand, shutter release in the other. The flash was 1/20,000 of a second or whatever, but images burn on to your eye for 1/3 of a second, so I could see how I was doing and I was able to make good adjustments. That shot stayed in my portfolio for a long time.