Flowing water can detect static electricity. In this demo, a baloon is rubbed on a carpet and so a negative charge is formed on the surface of the baloon. When the baloon is apprached to a very thin thread of flowing water, the flowing water is attracted to the baloon. This video was made by
Mustafa Daif on 11th March 2007 at his kitchen.
Static Electricity And Water - The best home videos are here