OK, not sure this is a demo so much as just a cool thing to do with bubbles. Simply use a rubber band to stretch terrycloth fabric over the wide part of a funnel made from the top of a 1 liter soda bottle. Dip the fabric into bubble solution and blow into the narrow part of the funnel (do not inhale!). The air pushes through the terrycloth to produce a stream or snout of many small bubbles.
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