One time, I was playing in the living room while my mother was watching something and a character on the TV said, "Oh! I forgot to close the fridge door!", and so Mum turned to me and said something along the lines of, "Don't you ever forget to close the fridge door."
Then later, I saw an episode of "Spongebob Squarepants" (which is this wacky cartoon about a talking sea sponge) where Spongebob gets sick from leaving his fridge open.
Both of those made me think that every time you left the fridge door open, something random, but always very bad, would happen.
A childhood belief about technology

others believed things like this
- that a piece of liver in your fridge if left overnight would wrap itself around a bottle of milkAnon
- i used to believe i was spongebob squarepants in a previous life.— former sponge
- I thought Spongebob Squarepants was a piece of Swiss cheese.— Melanie
- i used 2 believe when i left my closet door open at
night a skelleton would pop out and wave at me— bex - I thought if I left the door open too long, a dog would come from the cupboard in the washroom and eat me
Anon - I didn't believe that a cow's milk and the milk in the fridge were at all related!Anon