The house I grew up in had an irrigation ditch behind it, and my parents (not wanting us to drown or otherwise be hurt) had done a very good job teaching my sister and I that we were never, ever to go beyond the fence onto the ditch bank without a grown-up with us. However, we carried it a bit too far and believed the "no kids on the ditch bank alone" rule was some kind of cosmic law, and if you broke it, you'd be struck dead on the spot. When the (poorly supervised and mean) kid who lived next door went on the ditch bank to play, we'd both watch over the fence to see him drop dead. As he was an extreme bully, we were rather disappointed when he didn't. Bet he's in prison now, tho.
A childhood belief about excursions

others believed things like this
- I used to believe that mosquito larvae were baby hammerhead sharks. Made the ditch a very dangerous place!— Karen
- We would drive by UNION BANK here in California and I would say "Onion bank!" My Mom would bust up laughing.— BINGO
- i used to believe that if you were broke that you could go to the bank and get money for free!— Karianne
- I used to believe the bank "scottish widows" was run by widows, and only gave bank accounts to widows.— Angelmouse
- I used to believe that 'bankruptcy" meant that you were actually going to rob a bank — Mindy
- I used to believe that as long as there were checks in the checkbook, there was money in the bank.— Michelle