I used to think that a rare steak meant that it was hard to find. I thought there was common steak, medium rare, and really rare.
A childhood belief about general

others believed things like this
- I used to think that blue was a natural hair color but it as very rare, even rarer than ginger.Anon
- I used to believe that Steak was actually alligator meat. Anon
- I used to think that people who donated their kidneys were doing it for steak and kidney pie.Anon
- "The wombles of Wimbledon Common are we" meant that there were loads of them...— Mike
- I thought common as muck was a substance called commoners muck— oddsox
- It was common "knowledge" where I lived that if you picked dandelions then you would wet the bed.— Holly