Do it with chain or rope and then you can say "myth busted".

of course it's possible with a rigid arm, it's a super common circus act.

fixed supports is easy. Try it with chains.

We walked by yesterday... He's still going.

It's possible with rigid arms, and it's easiest when they're short. But people do compete over how long the arm can be. https://en.wikipedia.org/wiki/Kiiking

It's actually a sport in Estonia: https://en.wikipedia.org/wiki/Kiiking. The swing must have rigid arms.

To do it on a standard swing with chains, you need something to give you a serious push, like a Jetpack: https://www.youtube.com/watch?v=c0zAzqSa-5o

Nope. Needs to use chains.