I used to believe that a "round trip" ticket was where they take you up in an airplane and fly you "round and round" and then bring you home!
A childhood belief about aeroplanes

others believed things like this
- for the longest time every i used to think that Prince's "Raspberry Barret" said "round merry go round"— lin
- I believed my dad when he said that he could see round corners. — Charisma
- I used to believe, the little round bandaids, were to cover bullett holes.Anon
- i thought going to school was getting on the bus and driving round all day until they dropped you off. Anon
- Up until I was nine my uncle told me that the round bales of hay were cow eggs.— Fred
- Thunder was my dead uncle in heaven playing a round of bowling with God.— Mike