For some reason, when I was eight, I had the ludicrous idea that it was impolite to say, "Oh dear" within the vicinity of a cat because I thought it would make the cat sad.
I guess I thought cats were very sensitive and would mistakenly think you were saying, "Oh dear" about them or something.
A childhood belief about cats and dogs

others believed things like this
- I always thought cats were all girls & dogs were all boys ... I have no idea why.Anon
- I still hold my breath when I pass by cemetaries because it is impolite to breathe when other people can't.— Crystal
- Looking back at it, the belief that dogs eat cats is a pretty funny idea. I used to believe it myself.Anon
- 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.