This isn't my belief, but something a friend of mine heard a small girl say as she was exiting a store.
In New Zealand, there's a store called "The Warehouse." In the commercials, it always says "The Warehouse -- Where everyone gets a bargain!"
This girl was only about three or so, and so she didn't know what a "bargain" was, only that everyone who went to the store got one. Apparently, she was heard crying and wailing upon leaving the store about how she "didn't get her bargain!"
A childhood belief about going shopping

others believed things like this
- I used to believe that every time i went in a store that the grown ups had to buy me something.— jvf
- I used to think that the clothes in the thrift store were new— Ellie
- I thought change was the store's way of saying thank you.— Madeline
- I used to think that my mom had to buy ice cubes from the store and bring them home to fill up the trays.— Shawna
- for some time I used to think that at a drug store people really sold drugs.— NEO_ryu
- my mom told me that if i went inside the dresses at the clothing store, the dress would eat me...Anon