I Bet You Can't Beat My High Score!
You've no doubt seen YouTube videos where--just when your attention is at an all-time high--a scary zombie flashes on the screen, screaming at you, right? Well, you can do the same thing on an iPhone or Android device. This app, disguised as a game, will flash a zombie just when your victim thinks he's going to beat your score. You can download Scary Maze Prank for iOS, or Scary Prank for Android. Both are free. Or search either store for "scary prank" for more options.
Scary Prank for Android