Download FX-Guru on to your I-Phone or Droid, "it's free" and it will give you several free options, ( satellite falling on a car, etc) and it will give you the option to download new attacks. The RPG is one of the better ones.
Make sure you experiment with it, as you have to line up the base what ever your'e blowing up with target lines on the video editing software.
RPG works great on cars too. Only problem is these videos are too large to text msg, but you can send them to a drop box or E-Mail account and then E-Mail them out to a "friend".
I sent my brother a video of that RPG blowing up his pick-up, he parked in my way at our parents house...lol.