I used to believe that recycled toilet paper was actually used toilet paper that had been recycled. It didn't help that the one time I saw a roll it was speckled and not all white.
A childhood belief about bathrooms

others believed things like this
- The phrase 'Recycled toilet paper' always worried me.Anon
- 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
- I used to think that the wax statues at Madame Tussauds were made of recycled candles and crayons.Anon
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- I was convinced that paper could only be made out of Birch trees (because they had white bark).Anon