[TazeTSchnitzel]

Not quite the same thing, but James Randi famously debunked a “faith healer” by listening into to their analogue earpiece: https://www.youtube.com/watch?v=q7BQKu0YP8Y

Maybe more on-topic, an early demonstration of long-distance radio was hijacked: https://www.youtube.com/watch?v=sP2qqMegNKA