Liquid Soap in a Public Fountain
Dump a bottle of Ivory liquid dish soap into a public fountain. Come back in about 10 minutes to see the glory of your handiwork.
Even more insideous is a few bars of Ivory Soap dropped in the water return. The soap will slowly dissolve and be a lingering nuisance. Both ideas also work very well in a hot tub or a swimming pool.
Please do not attempt this prank if any living creature resides in the water. The soap will most likely kill fish or other creatures. Not only is it needlessly cruel, but koi can be very expensive if you have to replace them.
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