Until I was seven or eight, I thought the word "shit" was spelled and pronounced like "shet".
One day, I was watching "Double Dare" (a kids' game show in the U.S.), and the host, Marc Summers, was talking to a contestant about a certain pet that she owned.
"Does it shed all over the place?" he asked.
Well, you can imagine what I thought he said. I was appalled that Marc Summers would use such language and confused as to why he didn't get in trouble for it.
A childhood belief about swearing

others believed things like this
- I used to think that heater was spelled "header"(which i didn't know was pronounced hedder)— Olivia
- My sister used to think that "spit" was a bad word. She meant "shit".— "Spit!"
- I used to believe the word shoes was spelled shouse. It looked right to me... — Shouse
- I used to believe that the rapper Eminem's name was spelled M&M and anyone named Juan was spelled one.Anon
- When I was young I used to think that WHSmith was all one word, and was thus pronounced "Wwwhhhhuuusmith"— Nathan
- I used to believe that the word 'circumstances' was pronounced 'circus dancers'.— Mel