Looking for a cute and harmless April Fool's day prank for your iPhone. Consider iphoneception. It's a site that creates one of four special effects that mimic the iPhone's home screen, making users think that something deeply weird has happened to their unit.
Best of all, at least in terms of pranking, it can be installed and run on any unlocked iPhone (i.e. one that doesn't use a passcode). That's because it's just an interactive web page -- so you don't need an Apple ID to add it to a friend's unit.
You select the effect you wish to use (there are four, including explosions, gravity, kittens, and zom