On January 6, 2010, Sea Shepherd's fast-intercept catamaran the Ady Gil was rammed (formerly, Earthrace) by the Japanese whaling fleet's security vessel, the Shonan Maro No 2. The front 8 feet or so of the Ady Gil was sheared off, and one crew member suffered broken ribs. All crew were rescued by the M/V Bob Barker.
UPDATE: Those of you who think that the Ady Gil moved into the path of the Shonan Maru should look at this video, which was leaked (without permission). Aside from the fact that it is obvious that the Shonan Maru turns starboard to intercept, the Ady Gil is just idling and only motors at the end in an attempt to get out of the way. Note that I didn't post this video. I'm just linking to it on YouTube.