I used to think the word honeymoon referred to an engaged couple romantically staring at the moon, and saying 'ok, honey, we'll go to Spain or wherever!'
A childhood belief about marriage

others believed things like this
- When I was little I thought that a honeymoon was when the Husband and wife went to the moon and eat honey.— AmAnDa
- I used to think that when a couple got married and went on their honeymoon, they took a vacation to the moon.— Jen
- I thought that you actually went to the moon on your honeymoon. — Moonwalker
- that the word "couple" as in "a couple of items" was synonymous with "several", rather than "just two".— Blair A. Petterson
- I used to believe waffles were honey combs and thats why you would pour honey on it — Gaby
- I used to think being engaged meant being in jail. I have no idea how I came to that conclusion.— CNB