I used to believe that brown paper towels or toilet paper was "whole grain". I walked into a bathroom one day and said to nobody in particular (out loud, of course), "Wow! Whole-grain toilet paper! How fancy!"
A childhood belief about bathrooms

others believed things like this
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo
- I use to think that mummies were wrapped in toilet paper.— Glowworm
- The phrase 'Recycled toilet paper' always worried me.Anon
- I thought brown paper grocery bags would fit more than plastic grocery bags.Anon
- I used to think that when you sent a fax, the paper went through the wires.— em
- When I was little, I believed that clouds came from paper mills.— Ryne