I managed to convince my younger sister that the words to the Glen Campbell song "Rhinestone Cowboy" was "...and pole vaults coming over the phone" instead of "...and offers coming over the phone". Why? I have no idea - I was 12 yrs old! She finally found out one New Year when she was about 30 and sang along to the song at a party...
A childhood belief about misheard lyrics

others believed things like this
- Yep I thought the Zephyr song was fly away on my cell phone— Jenny
- I always thought that my relatives were really tiny, and inside my phone when I talked to them on the phone.Anon
- i thought I got one year older when my family sang the birthday song.— I am the ghost
- I thought the song "Party Time" by Moby was actually saying "heart attack" (this was before I knew the title)— Elviessa
- My friend managed to convince a gulliable kid at various stages of school that he was superman and a robot.— naff
- for my little sis -
Paul McCarty song "Band on the Run" but when she sang it it was "Man has the Runs"Anon