Scare Your Friends (com.northbridge.scareyourfriends) on Google Play
This app will make it easy to prank your friends. They will think they're playing a "visual IQ" game, and while they're carefully taking a "Visual IQ" test BAM!!! a scary face pops up with a loud noise. So make sure you have your volume turned up all the way. It also makes for a funny video, so pull out a camera and film them.Have Fun Pranking Your Friends!!!