I thought the hymn "Bringing in the Sheep" was "Bringing in the Sheets" and that people would sing it when taking dry laundry (sheets in particular) off the cloths line.
A childhood belief about hymns

others believed things like this
- When he was a kid, my husband thought the hymn "bringing in the sheaves" was "bringing in the cheese."Anon
- When the police are talking about "rap sheets," I thought that the criminals were making rap music.Anon
- I used to believe that when I used up all the sheets in my desk scratch pad, I would be married.— Barb
- I used to believe that undercover cops hid under covers/sheets. — Holly
- I used to think I smelled wrong, but I figured out it was because we never used dryer sheets. — blnkfrnk
- I used to believe that fax machines and computers sent real sheets of paper through the lines.— H