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This actually reminds me a bit of the gas bubbles we used to light on fire for fun days back in chemistry. Just take a tub full of bubble solution, put a rubber hose on a container holding whichever gas it is you use in chem labs and then stick a funnel into the other end of the rubber hose. Put the wide end of the funnel into the bubble solution so you get a thin membrane of it across the opening, turn on the gas a little and let it turn into a big bubble. Light the bubbles on fire with a candle attached to a yardstick for hours of fun!
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You can also just run the natural gas run right through the bubble solution to create a massive tower of smaller bubbles to equal effect.
Jam it back in, in the dark.