Galaxy 0402+379 is kind of an unimposing name for the greatest unexploded bomb in existence. It doesn't have one supermassive black hole - it has two, and is thought to be the result of a truly massive collision between two galaxies, each with only the standard "one mega-ultra-huge black hole per galaxy". A galactic collision is the second most amazingly violent event you can think of - the first will be when those two black holes eventually hit each other. The resulting merger will release energy on an utterly unprecedented scale, and emit gravity waves which will bend spacetime itself.
link: The Odd Case of "0402+379": A Galaxy With Two Supermassive Black Holes
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