My mom thought "ambulance" was "ambliance"
A childhood belief about speaking

others believed things like this
- Our mum told us that the ice-cream van noise was a children's ambulance— moonpants & sausage
- We had an antique lamp that I thought was hideous and for years I thought "Art Deco" was a synonym for ugly.Anon
- When I was younger I thought MTV was an x-rated station because I thought M stood for Mature.— Aeris
- I thought it was illegal to own a minivan if you lived in Arizona. I have no idea how I thought that.— Julia
- When I was 5, I thought you could walk on cloud. And I thought they are coton candy.— Pauline
- i thought when you went road hunting for deer i thought you ran them over— nick