I used to think that, because as a child I had graduated from potty seats to normal toilet seats, adults would sit without any toilet seat. So I spent a while trying to balance on an open toilet without falling in.
A childhood belief about bathrooms

others believed things like this
- I used to believe that toilet seats were for kids only and that adults sat directly on the bowl. — Evan Klyne
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G
- I used to think people had a "potty mouth" if they had been drinking out of the toilet.Anon
- I used to think you could get pregnant by sitting on a toilet seat.— Lisa
- I used to think that boy's lifted the toilet seat to pee because their asses were too big.— sydo
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo