I used to believe that to use a microphone you had to put a special device in your mouth which made your voice very quiet so that the microphone could 'pick up' the sound. I think this belief came from when I went to a circus when I was younger and the ringmaster leant over to speak to someone next to him without using the microphone and I couldn't hear his voice (even though he was about 25 foot away!)
A childhood belief about technology

others believed things like this
- I had my wife convinced that Steven Hawking made his fortune as the original voice for the speak N spell toy.Anon
- I used to belive that if i put my foot in my mouth, I would get foot-and-mouth illness— Emily Sathrota
- That if a pig loses its voice, it's disgruntled.Anon
- I used to sing at the top of my voice "OLD GIRLS JUST WANNA HAVE FUN"— claire
- When I was a kid I though facial hair on a man is what gave them the deep voice — Adrian Z.
- I used to believe the voice sped up at the end of ads was really just the world's fastest talker.Anon