Prepare the santa lie detector: You can create a fake lie detector using cardboard or poster board. Draw some buttons, lights, and a display panel. Make it look whimsical and festive.

Tell your friends this is a real lie detector test. They’ll think the app can detect if they’re telling the truth or lying.
Ask your friend to place their finger on the lie detector fingerprint scanner. The app will “analyze” and display a result: either truth or lie.

You can control the outcome! Simply press the "truth" or "lie" buttons before your friend places their finger on the scanner to prank them. If you don’t manipulate it, the app will automatically generate a random result for added realism.

Santa Lie Detector prank game.
Christmas Truth Test prank detector.
Naughty or Nice Detector.
Claus Credibility Scanner Prank.