I thought for years that the end of a nirvana song Kurt said All we are is all we know" and I thought that was profound and quoted it often.
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that, in a deep and profound kind of way, the words "door knob" rhymed with "said so". — Katie
- When I first heard Bruce Springsteen's song, "Born in the USA," I thought that the song was "Porn in the USA"Anon
- I always thought song went "I Believe In Malcolm" instead of "I Believe in Miracles"— Malcolm Lover
- In the song "Let's get it on", I seriously thought they were saying "candy on Crome". — Kate P
- I thought the song "Hit me with your best shot" was "Hit me with your pet shark"Anon
- For years and years I thought telephone poles grew.— Maureen