Chain lariat with hand drill or electric rotator.

Circular Motion Demo: The Chain Lariat. The flexible chain is rotated with a hand-operated drill.The loop of chain, suspended at the end of a wire, assumes a circular shape. Note: Start turning slowly, speed up gradually and evenly.
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Ask the participant if they've ever seen a rope lariat and how they think that works before demonstrating. It does take a slow startup to get the ring wide and stable. As always when you present a demo make sure you ask the participants questions before you demonstrate and after. Think about the concepts involved beforehand; having a friend ask you questions about it can be very revealing as to if you understand it well or not. Whenever you ask a question count to five (or at least three) in your head waiting for an answer before you stay anything else.