When I learnt that it was possible to be allergic to cats, I thought some cats were allergic to themselves. When I learnt that wasn't true, I thought it was impossible for a cat to have any allergies at all.
A childhood belief about cats and dogs

others believed things like this
- I used to think I was allergic to spoons (what a spoon!)— Sally
- I used to believe that I was allergic to the sun, because whenever I looked at it, I would sneeze.— John 117
- My sister and I thought cats and dogs were the same animal, the dogs were male and the cats were female.— Paul
- I alwaysused to think white cats were girls, and black cats were male ...— Smiley Face
- I used to believe that the cats eyes in the road...reflectors...were the eyeballs from real cats.— Liza P.
- I used to believe that CD's were made of glass, until I learnt otherwise.Anon