In the first verse of the Harvest Festival hymn "Come ye thankful people, come" there is a line that reads "All be safely gathered in, ere the winter storms begin". For a long time I thought that meant "Everyone be safely gathered indoors, before the winter storms begin". Only recently did I find out that it refers to crops, rather than to people!
A childhood belief about hymns

others believed things like this
- I used to believe that when winter came and it snowed the grass just died or went away for the winter.— Chris
- I used to believe as a child that t-storms (aka thunderstorms) where actually tea bags falling from the sky.— Samantha
- i used to think that the ice cream man went into hibernation in the winter....Anon
- I used to believe that we had winter to cool off the earth because it got too hot. Thanks, mom.— Jon
- A hot totty was a hand warmer used in winter.— Kari
- I used to believe that at the beach town where we spent the summer, they took the sidewalks in for the winter.— Missy