If you fancy yourself as a bit of a cheeky prankster then why not play a joke on your pals by installing this wallpaper on your phone - or better still, someone else's phone.

The background image simulates the effect of a cracked screen and can be installed easily onto any Java-compatible phone. The cracking effect is pretty realistic, particularly when the backlight on the device is off, so it's possible to really scare people into thinking that their phone has been damaged.

You can change the position of the crack on the screen simply by pressing the '0' key. This will randomize the location of the mark, as well as toggling between a white background and a black background.

It makes for a great little wind-up, although unfortunately there's only one crack shape to choose from. It would've been nice to have the option to select just a single crack or a couple of scratches just to add a bit more life to the joke.

A good one to remember on April Fool's day.