I only recently found out that accordions had bass buttons. I always thought that the piano keys or right hand buttons were the only way to get it to make a sound, and that whenever somebody in a video was playing an accordion with both sides they had edited in the bass part.
A childhood belief about toys

others believed things like this
- i used to believe the sound from a piano came from the keys hitting a stuff called "sploosh"{wierd, huh?}.— exploding buttox
- I used to believe that "according" meant playing the accordion, since it sounded like accordion. — According
- I used to think that the Eagle's song "Life in the Fast Lane" was actually "Pike in the Bass Lane."— Quilla
- i uses to believe that boys wee'd out of their belly buttons.— boys and toilets
- I used to believe that babies came out of belly buttons — kels
- that bunnies came out of belly buttonsAnon