This isn't really my belief, but my mom's. Anyway, I was listening to "Okay I Believe You But My Tommy Gun Don't" by Brand New, and my mom thought the opening line "I am heaven sent, don't you dare forget" was "I am having sex, don't you dare forget".
She was concerned...
A childhood belief about misheard lyrics

others believed things like this
- When I was a young girl I used to believe that drugs were sold in drugstores so I never dare get into one.
— inma d - I believed that kissing a toad would give you warts, but it never stopped me from a dare.— Kirstin
- I thought that Tommy Lee (the singer) and Tommy Lee Jones(the actor) were the same exact person.— Glowworm
- I used to think that testosterone was a brand of motor oil.— Grungi
- that DOT was a particularly popular brand of motor cycle helmet.— Gary Watrous
- Not me but my classmate. He thought that stereotyping was listening to the stereo.Anon