You see those potato chips-looking polystyrene thingies that they in parcels in order to protect their contents, right? My grandma and my sister once tried to trick me into eating one of those, putting them in a plate, like actual chips, and kept on telling that they weren't polystyrene crap. Even if I was a greedy kid, I had totally understood what was going on. But when there's a your grandma and your older sister insisting on the fact that those things derived from hydrocarbon were a yummy snack, you end up believing them...
I still remember the insane hilarity that rose few seconds later... Yes, I have a cruel family!
A childhood belief about sweeties

others believed things like this
- I used to believe that my belly button was for putting salt in while in bed, eating fish and chips.— Julie F
- I use to believe that potato chips were made from potato bugs. — Kayla
- When I was little I used to believe that the brown potato chips, you know the burnt ones, were worm infested.— Eric Rustman
- I thought that polystyrene was pronounced 'polly-STEE-LEE-an'.— Polly Stairiin
- When my grandma was little, her dad would tell her that the freckles on her face and arms were fly crap.Anon
- I used to think that if you ate the black bits on chips you would instantly die of cancer.— jayne