I used to believe that the "Guest Cast" listings in the T.V. guide that followed each program were the names of the people in the commercials, since they came in between the T.V. listings, just as commercials came in between the T.V. shows.
A childhood belief about tv

others believed things like this
- I used to believe that commercials would only go away when you bought the product that was being advertised.— Hayabusa
- Thanks to the commercials,I believed that Philadelphia Cream Cheese was made by Jesus.— Too Literal
- When I was younger I thought that if I ate Gusher's, my head would turn into fruit, like in the commercialsAnon
- I used to believe that the people who got shot in TV shows where people who wanted to die.Anon
- 'To Be Announced' in the TV guide was a film that was on all the time!— Clare
- When I was, like, three, i thought my cat was an evil sorcerer and would cast a spell on me. XD— Bobbet