When we were little, one of my dad's favorite comebacks was "You & what army?"; he used it any time one of us would threaten to beat him up, or take something from him, that kind of thing.
My youngest brother just confessed to me a couple of years ago (in his early 20s) that he always thought Dad was saying "You, and what, are me?"; the poor kid could never, ever make sense of that question! It was all too deep & philosophical for his little-kid brain.
Ever since he confessed that, every time I mail him anything, I put "You + what = me" on the envelope flap.
A childhood belief about speaking

others believed things like this
- That the earth was inside a gigantic envelope, and the stars were pinholes in the envelope.— Kara
- i used to think that the word e-mail was a sex, like male, female and e-mail.
I'm so thick!— Confoozed - I used to believe that, in a deep and profound kind of way, the words "door knob" rhymed with "said so". — Katie
- I used to believe that scientists were robots and they had some kind of chip in their brain.Anon
- I used to believe that the salvation army was an actual army.Anon
- i thought that "aromatic" duck was actually "asthmatic" duck.
poor thing...— rachael