When I was a kid I used to believe that there were 4 tubes or pipes that food went down when you swallowed them. The 4 tubes corresponded to- what was then- the 4 food groups. So when you choked on a piece of food and it "went down the wrong tube" it was because a vegetable must've went down the dairy tube...
A childhood belief about general

others believed things like this
- 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
- I thought when you got food poisoning it might someone had put poison in your food— Bootlebat
- i use to belive if you eat to much of a food u will turn into that food Anon
- I used to beleive, that if you swallowed a seed the food would grow in your body.Anon
- I used to believe that the lungs where tubes in the neck.— Some Guy