When I was little I used to beleive that when a guy got married his name was automatically changed from the full version to the short version (such as Phillip becomes Phil) and he would have to use that version. I got this because my dad, uncle and most of the other guys in my family all used the short version of their name and I was horrified about that because I hated (and still do) the short version of my name (Matt).
A childhood belief about marriage

others believed things like this
- I used to beleive that a catacism(spelling?) was an extremely painful Christian version of a bris.— Mike
- i used to believe a dog was the male version of a cat.Anon
- I used to believe a pickle was a smaller version of the cucumber.Anon
- I used to believe that a 'wolverine' was the girl version of a wolf. — Jelly
- I used to think that the female version of a Squire was a Squirelle — Kid wow
- I used to believe that God looked like an enormous version of "Woody" from the Toy Story series.— Ryan