I used to believe that food and drink went down two separate tubes, and when someone started coughing hysterically after swallowing, and someone said "it went down the wrong tube", I thought it literally meant that a drink accidentally went down the food tube, or visa versa
A childhood belief about eating

others believed things like this
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- I used to think that a Visa credit card was what one needed to be admitted to countries that "require a visa".— Stephanie
- if you eat toothpaste straight from the tube, you will get worms— wormelow
- I thought when you got food poisoning it might someone had put poison in your food— Bootlebat
- I used to want hemmoriods so I could use a "float tube" in the tub and have a cushy toilet seat like my dad.— Tami
- I thought that a "student visa" meant to use a credit card while travelling.Anon