This is just a random event, but it's fun to play around with. All you do is click the Red button, then hold down the Left mouse Button. If you go into the Events, then you can change the Projectile to whatever you want it to be. The numbers to the left of the Projectile can be changed from 0-100. If it's set at 0, the Projectile will just follow you. But at 100, you can just fire the Projectile.
Here is the save:
http://www.mediafire.com/?1qmjjdyiwwiThere is no need for pictures, it's just 4 lights and a block thing.