I thought "having been some days in preparation, a splendid time is guaranteed for all" in Being For The Benefit of Mister Kite was, "some beans, some raisins, preparation, a splendid time is guaranteed for all."
A childhood belief about misheard lyrics

others believed things like this
- I used to believe planes flew by being attached by strings like a kite.Anon
- i thought raisins were made out of jelly in a factory like gummy bears, i though this until i was 16!!!— jen
- i used to think raisins were inside out flies. i still can't eat them to this day. :)— booga
- Until I was about 6, I used to believe that flys were raisins with wings.Anon
- I used to think that raisins were dead flies. I only recently started to eat them again.— Toinette'
- My dad told me that raisins were the dead flies from the windowsill— Kellie