I used to believe that for on this side of the world, three leaf clovers were common, and four leaf clovers were lucky. But on the OTHER side of the world it was the opposite. Lots of four leaf clovers and not so many lucky three leaf clovers. I used to dream about going to the "other side of the world" and picking enough four leaf clovers to last a lifetime, and bringing them back to this side of the world so they'd be lucky.
A childhood belief about places

others believed things like this
- i used to believe that everyone had a twin on the other side of the world.— tahnee
- I used to think that there is another world on the other side of the mirror, where everyone is named Philip.Anon
- I used to believe that if I chewed on one side of my mouth too much the other side would get jealous.Anon
- I thought the world was black and white because of all the smoke from the bombs in Second World War.— Bjoern
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- I used to think that the phrase "It's a dog eat dog world'' was its a dogey dog world.— Gabral