The last time I was interviewed here in the UK, on BBC Radio Nottingham..I simply did Chronlogue (Bob Cassidy) to the Interviewer. On the way out the Car Park attendant, who had been listening on a pcket radio said--'How the hell did you do that trick with a diary'.!!
We had a magician on BBC during my childhood either at the end of World War 2 or thereabouts, who taught the listeners simple tricks over the radio. The series was a long one. His name was Sirdani. And his catch phrase was 'Don't be fright'.
He published these, often just puzzles, in a small book bearing his catch phrase name as the title. I actually have about 3 or 4 of his actual printed scripts. One idea which came, from I think The Great Kovari was to record a message on your answer phone. As 'This is The Great Foolum (your name of course) here. Thank you for calling. The card you selected in the studio was--name the card.In the studio you either get the interviewer to 'select' a card then he rigns up your home phone OR BETTER STILL get anyone in to select a card then the Interviewer phones your home and they hear the answer phone. Allen Tipton UK