From watching commercials on tv when I was a kid, I thought that charcoal briquettes only were hot if they were white.
When I was about 8 years old, dad thought that I was old enough to get the grill going. After a couple minutes I noticed that one of the briquettes got loose - thought it would be cool - picked it up to move it - got one hell of a burn blister on my thumb.
I learned at a young age not to believe everything you see on tv commercials.
Tv programs, (e.g. Dukes of Hazzard) were another story. :-)
A childhood belief about adverts

others believed things like this
- I thought that when you pressed the hazzard button in the car, the dukes of hazzard would come and save you.— smfd26
- When I was younger I thought that if I ate Gusher's, my head would turn into fruit, like in the commercialsAnon
- I used to believe that commercials would only go away when you bought the product that was being advertised.— Hayabusa
- Thanks to the commercials,I believed that Philadelphia Cream Cheese was made by Jesus.— Too Literal
- after watching "the wizard of oz" i thought kansas was black and white and the rest of the world was color!— kelly
- I thought cartoons were for kids and "real-life programs" for adults.— Ichigo