Up until I was about 7 or 8, I would never eat chocolate with peppermint in, because on the chocolate rappers they'd always have pictures of the mint leaves, and I was always taught that eating plant leaves was dangerous or deadly.
A childhood belief about sweeties

others believed things like this
- Chocolate, they say, rots your teeth. I believed if you drank chocolate milk, your bones would be brown.— Dellio
- I used to belive chocolate milk came from brown or chocolate cows.Anon
- I used to believe that eating chocolate laxatives made you stronger,don't ask me why.— pat
- I used to think that someone having dark-coloured skin was a result of eating too much chocolate.Anon
- I used to believe that chocolate milk came from chocolate cows.— Scott
- I used to believe that eating Coco Puffs with Chocolate milk would give me diabetes.— Julie