I always look for liquid surfaces, water in a glass etc. They will be busy oscillating much before the body makes sense of whats going on...
> “The mirror shaking was easy … put a little vibrating motor in and shook it.” Lantieri said. “But the water was another story. It was a very difficult thing to do. You couldn’t do it. ”
> “In order to replicate that for the eventual shot, they “fed a guitar string through the car, down to the ground, and then I had a guy lay under the car and pluck the guitar string,”
https://www.businessinsider.com.au/jurassic-park-water-cup-2...