When my daughters were little, like three or four, I devised a clever plan to teach them not to whine. When they used a whiny tone of voice I would cock my head and say, "Gee I almost thought I heard someone say something. But I can't hear a whiny voice, only normal tones of voice. I hope if anyone is trying to say something to me that they use a normal tone of voice because if they don't I'll never know what they want."
They both believed this as I made it a rule to NEVER pay attention to whining. (I would listen when they changed their tone and spoke without whining)
Niether child whined after the first few times!
A childhood belief about general

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
- 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
- i didn't beleive this, but a kid my sister knew thought if he screamed in a really high voice, he ran faster.Anon