Just read this in today's Far Out by Ben Forrest https://faroutmagazine.co.uk/telephone-receivers-diy-dj history of the telephone headphone.

Edited May 6May 6 by Happy Feet

You can also unscrew the earphone and hide your powder in it a la The Vicar.

I love that it mentions the combo of talc and whizz , I wonder what dodgy toe-rags they were getting their gear from having it cut with Johnson's ...