When I was little, I thought time was cyclical, and that the numbered years cycled around like the days of the week or the months of the year. I asked my mom "when will it be 1978 again?", and the response "never" invoked in me an existential fear I had not known before.
A childhood belief about general

others believed things like this
- I always thought that after 1999 it would be 1990 again, but with different months and days of the week
— optional - I thought that "tomorrow" was one of the days of the week— Frank
- 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 the lyrics to "Don't fear the reaper" were "Don't fear the reefer"— who new?
- My sister used to think that because I was 15 months older than her, I would die 15 months before her!— Nicola Braden
- I used to think the olden days came once every couple of yearsAnon