My older brother once convinced me that the ice that sometimes forms in the fridge was poisonous, and that I would die in 24 hours if I ate it. This was directly after I'd eaten some.
I was in hysterics for, ooh, i dunno...about...24 hours?
The next day I went up to my brother and said "HAH, I'm NOT dead, you were WRONG!"
He laughed at me. Not the reaction I was looking for.
A childhood belief about dangerous food

others believed things like this
- In kindergarden my friend told me that there were 24 hours in the day and 15 hours in the night.— Cari
- My older brother told me that speed bumps were really dead people covered in cement.— Trina
- i used to believe you slept for 100 hours every night.— skye-ness
- I used to believe that i swam more than 2 hours I would become a mermaid.— M11cazares
- I thought that days had 100 hours in them. Very surprised to hear there were only 24.— Cassiopeia
- I believed that if I swallowed my phlegm I would die. I spent hours spitting it out into the toilet.— chunky munky