I thought that, when an actor kissed another actor on tv, they had to get that actor's spouse to stand in for the other actor, because it was wrong to kiss anyone other than your own spouse. I think this was inspired by an episode of Mork & Mindy somehow.
A childhood belief about tv

others believed things like this
- i used to belive that actors in movie used to really get killed. Until i saw an actor die twice— calipzo avery
- I thought that the Allen wrench was named after an actor from Home Improvement, Tim Allen.— Jorge
- I thought that Tommy Lee (the singer) and Tommy Lee Jones(the actor) were the same exact person.— Glowworm
- When I was little I believed when an actor died in a movie, he died in real life.— Ben
- I thought that to get married, your spouse had to have the same eye color as you did.Anon
- I used to think that adam and the ants' stand and deliver was 'stand in your liver'.....— wook