I loved to watch Blues Clues as a kid. You know how Steve would say stuff like "Where was that clue again?" And then you'd hear a bunch of kids go "Right there!"
I always thought those were the voices of other kids who were watching the show at the same time as me.
And- it gets better- I thought that by yelling my answers directly into the TV speaker, this enabled other kids around the world to hear me.
A childhood belief about tv shows

others believed things like this
- I used to believe that toilet seats were for kids only and that adults sat directly on the bowl. — Evan Klyne
- When I was a kid I thought that when my parents were kids, the world was black and white and had no color...— KKM
- In primary school, a whole bunch of kids including me believed that watermelon seeds contained ants. — Caff
- I didn't quite grasp the concept of time zones, and thought that Chinese kids went to school at night.— Giselle
- when i was like 6 i thought only little kids my age could have long hair. dumb....lol— candy
- I thought that kids' pee was yellow and adults' pee was clear.— Aretia