Ack pht Nihil you're too fast on the keys

If you jam enough mass in a small enough space you'll up the density to a point where you'll make a black hole. Every explosion has a corresponding implosion at it's centre, thats how nuclear bombs are set off. So you could sqeeze your mass down pretty small (see someones previous post regarding 4th gen nukes, laser compression etc).
Unless you are using solar system sized amounts of mass the black hole would be increadibly tiny, probably much smaller than an electron. It could evaporate via Hawking radiation very quickly (instantly? Femptoseconds?) leading to Foxy's annhilation.