Candle Ghost Prank App

Imagine this. On your friend's birthday, you open the Candle Ghost Prank App which shows just a CANDLE. The cake is in front of your friend. Ask him or her to blow off the candle by blowing off in the mic of the phone. And suddenly out of nowhere a ghost appears in the phone with scary sound effects. Now that's some fun way to celebrate birthday of your friend, right?