The prank works on a timer. The user will choose from several illusions that claims to have a trippy effect on their mind. When the user selects an illusion the timer will start and within a few seconds a spooky monster will burst onto the screen with a scream of horror. There are several creepy faces you can choose from to fright the user, you can also set the timer. Forget other hoax apps with lame tricks and jokes, this app is the best way to put the fear of God into the unsuspecting victim. It's a funny and fun way to terrorize your friends with a little humor.