My older sister told me and my twin brother that if you didn't clap your hands during "if you're happy and you know it", you would get eaten by a monster while you sleep.
A childhood belief about monsters

others believed things like this
- My sister told me whenever I had a tummy ache it was my unborn twin inside my stomache trying to get out.— Jamie Field
- i used to think that every family had a brother and sister and they married eachother when they got olderAnon
- I used to believe that every person in the world had a twin, and that I had a long-lost twin in France.— Ashley
- As a child, my twin sister and I used to pronounce `Spaghetti' as `Mastaghetti'. Sounds a bit rude, no? Anon
- "She's got the Jack" by ACDC was "She's got the Clap".— Cybela
- My brother told me that I would turn into a boy when I got older. It made me cry.— Sarah