How to make a prank? For example:
Borrow a phone from your friend for a moment and install this app. Open it and set the time for about ten seconds. Press: "Show bugs". Application will be run in the background. Give the device back to your "victim" and ask him to do something on the phone that will keep his eyes on the phone for at least 10 seconds, (ex. check timetable, movie showtimes or weather forecast). After ten seconds, awful cockroaches will appear. He won't be aware of what is going to happen and for sure he will be extremely scared seeing bugs on his screen. Great fun guaranteed.
Important: at any moment, you can remove cockroaches from the screen by expanding android top notification bar and touching proper button ("Touch here to remove Bugs"). You can use "hide bugs icon in status bar" setting to make transparent icon in notification bar.
Animation of cockroaches is displayed on the transparent background and on the top of all system applications. That's why you see it all the time, regardless what you are doing on your phone.
Disclaimer: Starting from Android Oreo (8.0) and above versions some of system windows, e.g. top notification bar, will be drawn on the top of bug animation, so our disgusting insects will be invisible.
Main features of the program:
★ very realistic animation of cockroaches
★ choice of time after which insects appear on the screen
★ transparent notification icon
★ user can work on the phone while animation is displayed.
WearOS: this app is also available for WearOS devices. WearOS app is not a standalone app. To work correctly it needs phone app. Using your watch you can trigger the worms on your phone. Just press button on your smartwatch and worms will appear on your phone app.