I have no idea where she got this, but my little sister (who's four) took it into her head that umbrellas were really called rain-a-bellas. Now everyone in my family uses that word instead of boring old "umbrellas".
A childhood belief about around the house

others believed things like this
- I never had a make believe friend but my sister used to tell me I DID but he left cause I was really BORING.— Jamie
- My sister convinced me that rain was God's pee.— Scott
- my sister when she was little thorght head lice tried to borrow into her head to get to her brainAnon
- My dad thought when he was little, rain was caused by army guys in the clouds with rain guns. — Daughter of the Weird
- I used to believe I could control the weather by singing rain rain go away or blowing the clouds away.— Shannon
- I believed that the rain would melt everything...I was terrified to go outside in the rain! — Cris