My mum always thought (and, sadly, still thinks) that the song "smoke gets in your eyes" by the Platters is actually "small cats in your eyes".
A childhood belief about misheard lyrics

others believed things like this
- I used to believe that the cats eyes in the road...reflectors...were the eyeballs from real cats.— Liza P.
- The Kim Carnes song called 'Bette Davis Eyes' well my dad used to sing "She's got Dickie Davis Eyes" Anon
- I used to believe that cats eyes were lit up by a man running under the road with a torch— Martin
- I was born brunette with brown eyes and dark hair, i thought people with blue eyes, had water in them.Anon
- When I was little my friend told me that if you snease with your eyes open you eyes will fall out!Anon
- when I was young I used to believe if I squinted my eyes and it was windy my eyes would stay like this forever— Jeanne