A pinch twist is sort of a knot. If you pop the balloon after a pinch twist the rest of the balloon will stay in place. You can use it to separate arms.
Balloons needed:
Anything that you can pinch twist.
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1 Pop bubble between the pinch twists.
▶ video
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2 And voila, balloon stay inflated. A video demonstrating it is also available.
▶ video