My dad used to say that if I sat with my back to the fire for too long I would get "floating kidneys".
A childhood belief about general

others believed things like this
- I used to believe that kidneys were located in your knees.Anon
- I used to think that kidneys were where babies ('kids') came from. — Ri
- If you stood in front of the fire for too long your spine would melt!— Helen, Cumbria
- I thought that I could get a suntan if I stood really close to a fire for long enough.— Mat
- I thought your loins were kidneys, and nobody corrected me until I was a teenagerAnon
- I used to think that people who donated their kidneys were doing it for steak and kidney pie.Anon