So this glitch I find is pretty easy and really fun. So all you have to do is get your RPG (or Firework Launcher) and go to a water source and dip the very tip just underneath the water. So for the RPG for instance you would just put the grenade tip under the water AND THEN FIRE! watch as they spin slowly out of control and most of all have fun with this! Here is a video that shows you how to do it if you still cant really figure it out. (Its okay it took me a few times too to get it.