When I was a little kid, I used to believe that food and drink would go down different tubes in your digestive system. The tubes separated somewhere between your neck and your stomach, and somehow food and drink knew which tube to go down. The food tube ended at your butt, and the drink tube ended at your penis.
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 believe that the lungs where tubes in the neck.— Some Guy
- if you eat toothpaste straight from the tube, you will get worms— wormelow
- 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 use to believe that salt would cool food down while pepper would heat your foodAnon
- I used to believe when ordering Chinese food the food and delivery man came from China— Dave