Algodoo

I was just messing around just now and for some reason began to put in negative values for the material properties and noticed that they were a bit, well, aside from being unstable that they tended to like to fling stuff. So, I slapped this together and, it actually works. Im not sure what i will use this for in the future, but i thought it would be cool to share. Also included, in the spirit of "Railgun-ish thingies" Is an Intentionally built railgun that uses gravity instead of, well, what i can only call "Algodooian witchcraft". (Enter to fire, arrow keys to aim it) Tell me what you think about this really weird stuff..