There's this Disney movie called "The Great Mouse Detective", about how the mouse who lives in Sherlock Holmes's house is also a detective.
In the very beginning, when Fidget was about to kidnap Olivia's father, there's a shot of the door handle moving up and down, and Olivia yells "What's that?"
I used to think that she said "The satch!" and that a satch was another word for a door knob.
A childhood belief about films

others believed things like this
- I used to think that Olivia-Newton John was three people like Sharon, Lois and Bram....Olivia, Newt and John— J
- I thought that Olivia Newton John was a group, Olivia Newt and John. — Sam O.
- I used to think that Olivia Newton-John was 3 people: Olivia, Newt, and John— Sally
- I used to think that when I moved the mouse around on the mouse pad, I was giving the computer a massage.Anon
- Olivia Newton John did sing let me hear your budgie talk! didn't she— J Scull
- My great-grandfather firmly believed, and had me convinced, that SPAM was mouse meat. — texasblue