For a long time I thought Alfred Hitchcock directed the movie Jaws. In fact I didn't realise the truth until I was 18 and someone corrected me..
A childhood belief about films

others believed things like this
- Phil Collins song "I missed again" - I thought it was "I pis*ed again" - didn't realise he was an alcoholic?!Anon
- A friend believed that they used a tame shark during the filming of "Jaws".— Wendy
- I thought your loins were kidneys, and nobody corrected me until I was a teenagerAnon
- I thought the mole on my arm was from a bug pooping on my arm a long time agoAnon
- I thought Viagra was an allergy medicine for a really long time.Anon
- I thought for a long time that beaver and badger are the same animal— Ted Snow