Drones are already pretty fun to play around with. Add a laser to yours, and you are going to be able to do a whole lot more with it. LaserGadgets has put up a video that shows a laser drone in action. You will be able to use something like this to go after balloons or any other thing you can think of.
As you can tell, this is probably not the best way to use a drone. Besides, this is probably too dangerous to try anyway. LaserGadgets is not selling this drone, so if you need one, you are on your own.