When my sister and I were younger we fought a lot (I love her to death now).
I remember how she always liked to play with my mother's make-up and perfume in the bathroom, and she'd spray ALL the different perfumes a lot and make it smell horrible. With only one bathroom to share, that kinda sucked.
One day after she sprayed a whole bunch, I had to pee and found what she was doing. I was annoyed, so I told her that mixing different chemicals can create an explosion. Then I locked her in the bathroom, holding the door from the outside. After I took off, she told on me.
The BEST part about that was that when she told my Dad, he responded something like, "Well, technically you never know what shouldn't be mixed..."
A childhood belief about chemistry

others believed things like this
- someone told me that if u go to the bathroom on the toielt you would get sucked inn..— terrified child
- That blue cheese was made by scraping mould off bathroom walls. My mother actually told me that.— sandee
- I actually asked my mother if mixing girls' poop and boys' poop would cause an explosion.— kraine
- Grandmother told me if I whistled in the bathroom the devil would come get me because I was whistling for him.— Peanut @ Lake Tawakoni Tx
- I remember once a friend of mine told me that when ever you hold in your pee it would make your balls stronger— Zao
- When I was little, I thought that bug spray would make bugs explode and disappear. Anon