**Uses no special apps!**
The spectator thinks of any word or number, and then is invited to type it into the notes app of your phone to show their friends.
Without you touching the phone, they close the app, and lock the phone. You take it back and immediately put it away in your pocket.
Then, you read their mind.
It’s fully Impromptu, organic, invisible, and easy to learn.
(Note: This effect requires iOS)