You’ve gone to the local county fair. You want to play the game where you throw darts at a balloon to win a prize.

First, however, you have to tell the vendor your phone number and give him the contact info of everyone you know. You also agree that the vendor can find out precisely where you are in the future, whether or not you’re playing the game.

Of course, this sounds so very reasonable, so you agree.

When you’re done playing, you walk away from the booth, but the vendor still has your phone number and the full contact info for you and everyone you know. If you decide never to go back, he won’t be able to know where you are anymore, so there’s that.