Razor Prank

With the realistic virtual razor audio and the vibration coming from your smartphone you can prank your friend by trying to shave or trim their hair with your smartphone.

Just make sure to place your phone's screen downward so the sensor of your phone will know that your phone is near the victim's hair and ask someone to record the prank to capture the funny moment.

BONUS: try to get a fake hair so your friends will think that you actually cut their hair.