This is really embarrassing as I wasn't even a child at the time!
When I was 14 I got a Bryan Adams CD which I really liked. Unfortunately I thought the first line of "Summer of 69" was "I had my first real sex dream" instead of "I got my first real six string." My church youth leader said we could bring CDs to the youth group as long as the songs didn't have anything rude in them and I never took my Bryan Adams CD along because I thought it was rude!
I am now 23 and only found out a couple of months ago what the real words are. My husband is still laughing at me.
A childhood belief about misheard lyrics

others believed things like this
- For the longest time I didn't know that Spinal Tap wasn't a real group. No wonder I couldn't find their music.— Louis
- I recently found out that Euthanasia is not Asian youth.Anon
- I used to believe that all languages were just jiberish and I asked my mom why they didn't use real words.Anon
- As a child, my twin sister and I used to pronounce `Spaghetti' as `Mastaghetti'. Sounds a bit rude, no? Anon
- When I was little my uncle had a huge adams apple. He told me he'd swallowed a marble.— Stacey
- For many years I didn't understand why everyone was talking about the 'youth in Asia' (euthanasia).Anon