what technique did spielberg use to make the cup of water vibrate in jurassic park?

Question by skoobie: what technique did spielberg use to make the cup of water vibrate in jurassic park?
i remember reading an article long ago about what a challenge this effect was for him… as i sit watching the movie again, i can’t remember the solution. thanks!

Best answer:

Answer by MystMoonstruck
Courtesy of IMDb:
The glass of water sitting on the dash of the Ford Explorer was made to ripple using a guitar string that was attached to the underside of the dash beneath the glass.

This is from Wikipedia:
The ripples in the glass of water caused by the T rex’s footsteps was inspired by Spielberg listening to Earth, Wind and Fire in his car and the vibrations the bass rhythm caused. Lantieri was unsure of how to create the shot until the night before filming, when he put a glass of water on a guitar he was playing, which achieved the concentric circles in the water Spielberg wanted. The next morning, guitar strings were put inside the car, and a man on the ground plucked the strings to achieve the effect.
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I recall the simple trick being shown in a documentary about the film. Prior to that, they said that they had conducted several costly experiments that failed to produce this memorable image.

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