I was ten years old, and playing croquet with my cousins.  We began to argue about the rules, and called upon my aunt to referee. “Marilyn! Tom says you have to go through the wicket twice at the end; I think he’s lying!”

Marilyn disappeared for - count them - three minutes, and returned holding a slim, faded pamphlet.  She paused on the side of our croquet field and proceeded to read, “The Rules to Croquet.”

“You OWN the rules to croquet?!” I asked, stunned, “ - And you knew where to find them?!”

“Of course,” my aunt smiled, “I knew exactly where they were - in my filing cabinet under “i” for important.”

"File under i” is where I put everything that's really important.  wink.