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This app uses the smartphone touchscreen and haptic feedback to deliver a pyrotechnic effect complete with "shock" to an unsuspecting victim touching the phone screen.
That's all it does. Kind of a joy buzzer for modern times.
Spark for Android -- Free
This app does only one thing, it uses the iPhone speaker to blow a light puff of air. That's right, it can even blow out a candle using the smartphone.
It's apparently for those unable to blow candles out without assistance, or those who like to annoy their pets.
Blower for iPhone -- $0.99