Mobidroid
Fake snap
$0.99
A very simple app that fake the action of taking a picture with the flash and sound of the camera. For your convenience, you can add a widget to your home screen to launch a flash, or just put the normal application on the home screen and take "fake" picture from the application...
Omnidar
$1.29
The omnidar is the most powerfull detecting device available to mobile phone. Well that's what you need to say to the prank victims around you. Start the omnidar and pick 1 of the 3 themes available Then set the "source" azimuth Step 3: Act like the device really detect the source....
Dildroid
FREE
Move the doodle so your phone vibrates