I used to believe that you were not supposed to laugh out loud at TV sitcoms. I think because no one laughed when there was a laugh track.
A childhood belief about tv

others believed things like this
- I used to think that the laugh track on sitcoms were the camera men, directors, other actors, ect. laughing.Anon
- When i was little i thought that people could laugh in different languages— Lauren
- I thought the expression "so funny I forgot to laugh" was literal instead of sarcastic— Not so funny after all
- My girlfriend belived that sitcoms were called that because you sat down to watch them.— Zeppy
- I used to believe that if the tyres were removed from a car, it would work perfectly on a railway track.— Anonymous Whistleblower
- I used to think when somebody sneezed you were supposed to say 'Gableshew'.— gablesh