When I watched Countdown when I was little, I thought there were such words as LJTEBDOFV and DLBAECGUV. They weren't, but letters that Carol put on the board for the word games.
A childhood belief about spelling

others believed things like this
- I used to think that board games were called bored games because you play them when you're bored.Anon
- I used to believe that boarding school was where people went to play board games.Anon
- From the first six letters of this word, I thought that “megalomania” had something to do with megalodons.— Enrico
- I used to believe that a weegie board was some sort of surf board.— Missa
- I thought the word economical was actually two words: eek and omical.
— Nancy M. - I used to think the word "european" had something to do with pee, and that kids weren't supposed to say it.Anon