I used to believe that the bridesgroom was the room at the back of the church where the bride got ready. The groomsmen got her ready, ie. groomed her.
A childhood belief about marriage

others believed things like this
- I believed that if I ate Ready Brek, I'd glow like in the TV ad. — Why Aren't I Glowing?
- I used to believe that after eating Ready Brek I would glow, but that only adults could see it.— michelle
- When I was a child I used to believe that cows gave ready butter.— Bane
- i used to believe that red yellow and green meant "ready, set, Go!" on traffic lights..— cabagona
- I used to believe that lizards were little dinosaurs ready to enlarge of they touched the water — Mark
- I used to think that church songs were pop music. Well, we did sing them in church every week...— Roxy