Until recently,I thought that the following line in Carly Simon's "you're so vain" went "I had some dreams,there were clowns in my coffee, clowns in my coffee." It was really "i had some dreams. They were clouds in my coffee,clouds in my coffee.
A childhood belief about misheard lyrics

others believed things like this
- I thought you could get toffee from mixing tea and coffee.Anon
- until 12 yo i thought buying and drinking coffee was illegal when you were under 18:) — smarty
- I used to believe that coffee was tea with milk in it.Anon
- I always refused to eat coffeecake because I thought it was made with coffee grounds. Anon
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I used to think it was illegal for children to drink coffee— C.W.