Not my belief sadly but a sweet one nonetheless.
I used to lodge with a young family in Northern England. There were 2 youngsters including a 5 year old lad. The house was large and old with a dark and scary cellar. The lad was told by his mother that they were going to look at a new house in a nicer area. He asked if it had a scary cellar and was reassured that it hadn't as it was a new house and they don't have cellars. Toi this day that young lad still believes that houses grow cellars as they get older.
A childhood belief about basements

others believed things like this
- when i was young i believed that when u moved house the house would come with you !!!
just like a turtleAnon - I used to believe in ghosts because I always heard noises comming from the cellar.— Sabrina
- I used to believe that when you moved house you swapped house with the person moving into your old house.Anon
- I used to believe that when you moved houses, you traded homes with the person whose house you're moving into.Anon
- The Whit house down the street was the real "White House". — SG
- I used to believe that if you opened up an umbrella inside your house that the whole house would fly awayAnon