Install the MacDroid app on you phone. macdroid - Google Play
Set up this macro:
Trigger: Volume up pressed
Action: Speak Text
Text: [friends name] can fly
Tell friend you have installed “no fly list with facial recognition” on your phone.
Hold phone as if taking picture of friend.
Tap volume up button. Phone will say 'Ben can fly" (or whatever).
This simple gag provokes some interesting reactions.