I used to believe that doctors couldn't get sick because it was their job to fight sickness. To me, it seemed as logical as police officers not committing crimes because it was their job to fight crime.
When my mom asked me what I wanted to be when I grew up, I proudly proclaimed, "Doctor!" When she asked why, I said, "So I can never get sick again!"
She laughed and cleared things up for me. I was quite peeved to find out that doctors getting sick and (somewhat later) police officers committing crimes were not uncommon occurrences.
A childhood belief about work

others believed things like this
- I used to believe that doctors could not get sick.Anon
- I used to believe police officers can't get arrested.— Anonymous
- When I was a little kid. I thought that police officers were a gang of mean people who bullied others.— LOOL
- I believed that traffic lights had police officers inside them, turning the lights on and off...— CrowHeart
- I used to want to be a doctor when I grew up, because doctors never die, as they can cure themselves.— Stuart
- I thought Pink's "You make me sick" was "you make me sick, you make me look like a candlestick" LOL— Rice