My parents listened to alot of Beatles music when I was little. When I heard the song "Eight Days a Week" I figured that in England there must be eight days to the week. I spent alot of time wondering what the eighth day was called, and trying to figure out why they got an extra day.
A childhood belief about general

others believed things like this
- I once refused to believe in Thursday. I'd heard there were seven days in a week, but could only name six.Anon
- I thought that "tomorrow" was one of the days of the week— Frank
- I always thought that after 1999 it would be 1990 again, but with different months and days of the week
— optional - I used to think the song Bette Davis Eyes was called 'she's got better days besides'.— JJ Simpson
- I used to think that church songs were pop music. Well, we did sing them in church every week...— Roxy
- I used to think that swing music was called that because you listened to it when playing on the swing set.Anon