When I was 6 (or maybe 7), and on a country walk with my family, I referred to "that shoop".
Well, several geese, but only one goose, therefore several sheep, but only one shoop.
It was perfectly logical to me at the time, and, come to think about it, I might start a campaign to make my version the correct one...
A childhood belief about speaking

others believed things like this
- My favorite excuse:
Must be those trouser geese again!— Tootie Fruity - When I was little, I thought the singular form of geese was "gee"— Kate
- After Grange Hill's "Just say no campaign" that people would force me to take drugs ... if only.— Netty
- i used to believe (when i was little) i could make the wind stop and start by saying, "stop" and "start"— Ali
- I used to think dogs had hooves, because they make hoofbeat-like sounds when they walk.— Samuel Lamont
- I used to believe that every country in the world had the same time. Guess I didn't consider time zones eh?— what are time zones again