You participate in a game show where you must choose between 3 doors. Behind 2 doors is a goat, but behind 1 door is a car. You pick a door, say door no. 1, but before you open the door, the host opens another door, say door no. 3, which has the car behind it. "Oops," says the host.
You lose.
I remember being a teen and being incredibly stubborn about the monty hall problem untill I "got it"
It was one of my first red pill moments before I knew what that was.