When I was about 13, I had heard that an original champagne glass was modelled on Marie Antoinette's breast. I was familiar with the long thin champagne flutes to be the original champagne glasses and it wasn't until I was the age of about 18 that I realised the original champagne glasses were wider and shallower. For all that time I thought that Marie Antoinette had really long thin boobs!
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
- i used to beleve that the sun had thin long legs and followd me wherever i went..— Hege
- I used to believe that people who wore glasses were blind and could only see when they had their glasses on. Anon
- Strangers in the night, exchanging glasses...
well I was only young at the time!— ..maz.. - I thought until fairly recently that bacon came from the skin of a pig and that's why it was so thin— Nate
- I used to believe that the sky is just a very thin blue egg shell— Alan