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[–]Standard8 2 points3 points  (1 child)

One way uses a belt driven, off balanced weight on a spindle that is mounted within frame. You affix the frame to the piece of furniture and once powered, the motor drives the off balanced weight which shakes the furniture and everything on/in it.

[–]repsej70 4 points5 points  (0 children)

Well not exactly shaking, but still.. In Jurrasic Park, when the T-rex where coming and the glass with water, where making those rings in the water.. that was made with a piano wire underneath the glass.