I used to believe that there were three pipes in your throat. One for food, one for drink, and one for breathing.
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 when you fart, your tummy was breathing!— Nicholas Orsmond
- When I was a child, I used to believe that when we slept, we stopped breathing.Anon
- When I was about 4 or 5, I used to believe that instead of bones, we had metal pipes. — TL
- I used to think when you smelled a fart, that you were breathing in tiny pieces of poop.— brandypandy
- I used to believe that car exhaust pipes were what propelled cars, instead of the engines.— Thomas Johnston