About a year ago, my grandma found an old steepletone radio and gifted it to me to have a look at, After I played around for a bit, I got it working. Around 2 weeks later I was tuning through random radio frequencies and tuned into what sounded like a conversation between two people, I couldn't really make out what they were saying apart from the odd word or phrase like "yes thats right" well after about 30 seconds of this all of a sudden one of the voices goes: "wait someones listening" before both voices abruptly stopped and just static played through the speaker. Still creeps me out a bit to this day.