I used to think the word "stag" meant naked. I was shocked to hear my Baptist preacher father announce from the pulpit that the men's prayer breakfast would be held in our home, and that the men needed to "come stag".
A childhood belief about speaking

others believed things like this
- I used to believe jaywalking meant walking around naked in public (from naked as a JAY bird...)— Izzi
- When I was learning the Lord's Prayer, I used to say, "Our Father, who does art in heaven...."— Karen
- Well I once believed that when someone was home alone, they'd walk around naked..Anon
- I used to believe that in the Christian Prayer of the Faithful, we were responding, "Lord, harrow prayer."— Smelleanor
- I used to believe that showing my bare arms meant that I was naked, so I never wore short sleeves as a kid. Anon
- I used to think that teachers always had to officially announce to the whole class why someone was off sick.Anon