There could have been number of answers if you were just not a skid.. Dude, learn. Your questions are the skidddddddiest ones around here. But you don't care, do you?
Anyways, get tasker. With a rooted phone, you could get more from it. Although to use it well, you will have to work hard to understand it. It is not a prank app, but if used well, could be the app you can't live without.
And for the prank part, you can do it with the tasker's app factory. Options are limitless.
