For years my Brother thought Hi-Di-Hi was set in the present day rather than the 1960s.
He also though it was illegal for someone to be on 2 different television channels at the same time.
A childhood belief about tv shows

others believed things like this
- I used to think that Legal and Illegal meant the same thing (illegal)— Dhruv
- When i was a kid, i thought that the tv changed channels by dark magic.— Anna
- last time when the television was on i thought the people were performing in it -.-
— irritated kid - I was told that for every christmas carol i sang before christmas time santa would give me one less present!— K
- I thought driving while having to pee was illegal.Anon
- I used to believe that I could jump through the television and be where the people were on television.— Ash