talkmagic.co.uk

It got me thinking however, is any part of it genuinely dangerous?

your putting needles in your mouth, so yes. it can be dangerous.

There's a needle-threading-in-the-mouth trick in one of the very early issues of Annemann's JINX magazines. They're all available on the Learned Pig website, so have a look there.

NB: A later issue has some updates and improvements on it, so keep reading.