I used to think the lyrics to Row Row Your Boat were " life is butter dream" it wasn't until I was about 12 that I realised it was "but a".
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that the last line of Row Row Row Your Boat was 'Life is butter dream'.— Mindless Misfit
- row row row your boat gently down the stream...merrily merrily merrily merrily life's a butter bean.— bleeslady
- My mother told me if I ate too much butter I'd get worms. I didn't eat too much butter...— Dicky
- I used to think life was a dream and I was in heavenAnon
- I used to think that life was all a dream and one day i would wake up like a 75 year old woman.( who knows?)— 8 with wrinkles
- I thought that life is a dream and when you die you wake up (maybe it's true who knows?)— Naos