I was about 6 and was watching a particularly good episode of Knight Rider one day, when Michael Knight was invited round to a sassy lady's apartment to do some investigative work.
She then offered him a drink whilst leaning seductively over a bar and he replied, 'No thanks, I don't drink.'
And so I believed for the next few years that Michael Knight didn't drink...anything...ever. Not even water.
A childhood belief about tv shows

others believed things like this
- My little sister's imaginary friend was Kit the talking car from that show Knight Rider.Anon
- I used to believe, driving in front of all the other cars on the highway, Knight Rider was leading the pack.— Michael Kolassa
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- My mum used to tell me that you couldn't drink water out of the tap from the bathroom as it was poisonous.Anon
- When I was young I refused to drink well water because I thought it came out of whales.— itodd
- I used to think that if I ate a fruit seed it would grow in my stomach if I drink water after thatAnon