I used to think that the last line to "I've Got A Lovely Bunch Of Coconuts" was "Take one small one, balance it on your head." I only realised it was "Big ones, small ones, some as big as your head" when I saw it written down. I've never had brilliant hearing.
A childhood belief about misheard lyrics

others believed things like this
- When I was small, my brother would bug me and say that if my hand was bigger than my head, I had a tumor.Anon
- when i was small my brother always told me that if you picked your nose your head would cave in— Eric
- my sister when she was little thorght head lice tried to borrow into her head to get to her brainAnon
- i used to belive that if i fell on my head my head would come off while i was doing a cartwheelAnon
- i use to belive that mum could vac up my toy no matter how big or small— beach bum
- When i was small boy i think that there will be a conductor in the aeroplane,like in a bus.— Umesh