Well, at least it served some purpose.
Finding it to be a floating hazard, the US Coast Guard decided to sink the tsunami-dislodged Japanese "ghost ship" Ryou-Un Maru, yesterday.
To see the video, it looks like they needed the gunnery practice.
Interesting that they decided to use the 25mm cannon. I would have thought that a 5" gun would have been more appropriate for sinking a 200' vessel, but perhaps the USCG ship Anna Kappa hasn't got such armament. Or perhaps they wanted to let everyone get a shot. I'm guessing probably it was a Mk 38 that they used?
The depths of my ignorance about such things naval have not yet begun to be plumbed, I tell you.