My mate told me that when he was young he thought a double-decker bus had 2 drivers - one for the top deck and one for the bottom! The driver on the top had to be really good to keep the top deck directly above the bottom!
A childhood belief about buses

others believed things like this
- I thought I would fall through the cracks in my grandmother's deck.— Hannah
- I used to believe that your bottom teeth were actually in your bottom— jez
- i thought if you went to the bottom of the earth you would fall off.— Tiffany Amber Stefanko
- I used to believe that when you had cancer, your bottom would be in front instead of in back. Anon
- I used to believe that elfs lived in the hedge at the bottom of my garden!!
— The milky bargirl - I used to think my belly bottom was my "front butt" lol i know...stupid!— Megan