Not ESP is a drawing duplication routine that you can carry with you everywhere and perform at a moment's notice.
 
"This is by far my favourite thing to do instantly, on-the-fly...
It is just real."  —Lloyd Barnes
 
You take out your phone and open the notes app. Using the drawing tool, you explain that you're going to try to pick up on the participants' thoughts.
 
You then ask them to do the same thing on their phone. When the phones are turned over, both images match.
 
It's easy to do, and everything you need to perform the effect is included. You do not need any additional subscriptions or add-ons.