There Are Two Kinds Of People. One Kind Can Draw Conclusions From Incomplete Data.
The hallway my college dorm room was in had a large whiteboard posted along one wall. Unsurprisingly, it became a locus for a variety of graffiti. As it filled up, a few hallway residents denoted themselves as the “Keepers of the Board.” They had a notebook where they’d write down anything they deemed interesting or amusing enough and erase the board to make room for further doodling.
One day, my roommate and I came across the Keepers busily at work recording the most recent whiteboard notations. They were discussing a particular graffito and trying to decide whether they felt it was witty enough to merit entry into the annals.
My roommate leaned in and read the item.
Roommate: “There are two secrets to success. Number one: Never tell anyone everything you know.”
After a pause to digest this morsel of wisdom, he asked:
Roommate: “Wait, what’s the other one?”
The Keepers traded an amused look.
Keeper #1: “Quick! Write that down!”
Another one did so, attributing it to my roommate. Then, they dutifully recorded the entire exchange in the notebook before erasing the message from the board.