When I was little I used to tell my younger brother and sisters that our house had an attic, and that there was a girl that had lived up there long ago and they never let her down... I had them believing that there was whole bedroom up there where the girl died, and that her ghost still haunted the place. Of course, we only have a crawlspace with an entrance through my mom's closet, and there's definitely no bedroom up there, but they believed it for a long time. I still get scolded for being such a mean sister, but it was worth it. ^.~
A childhood belief about ghosts

others believed things like this
- I used to believe my bedroom closet was actually a time machine.— Carrie
- I thought Buckwheat from "The Little Rascals" (1994) was a girl because he had long hair!— Molly
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg
- I used to think that Cain and Able were brother and sister (with Able being the girl).— Duh
- I thought everyone only had a set number of breaths before they died.
I breathed slowly for a long time.Anon - I thought that a quarter hour was 25 minutes long, since a quarter was worth $0.25.— Crystal