The first time I heard of a store being "out of" an item, I was very surprised. I had previously thought of stores as magical places able to create an unfailing supply of whatever things they sold.
A childhood belief about going shopping

others believed things like this
- I used to believe that you could create money (that you didn't previously have) by writing a check.Anon
- for some time I used to think that at a drug store people really sold drugs.— NEO_ryu
- I used to believe that drug stores sold illegal drugs and I couldn't work out how they got away with it.— Bigg Jase
- I thought drug stores sold drugs. I never understood how they could sell illegal drugs.— Diana Rios
- When I was little I thought "Pencilvania" was a huge store that sold pencils and nothing but pencils.— Tim
- My sister thought a fruit machine (the gaming device) could turn one item of fruit into another.— Richard Davies