Watching "Pacific Rim" and enjoying the hell out of it for the entertainment value, btb.
There's a scene where the protagonists are using a ship as a handheld bludgeon. Sure- it's roughly cylindrical and resiliant and made of a lot of steel.
From my perspective, though, a ship is much too fragile to be used as a baseball bat. To me, a ship is a fragile conveyance, might as well be made of glass as far as I'm concerned. Stretch, wrack, deflection, bending modulus and all the myriad physics issues that make my ass pucker on a daily basis. Keel cracks, shell plating fractures, spiral keel fractures... those things you can do by simply loading shit on board badly sitting against a dock. A bludgeon? Hell no. I spent enough time on deck in heavy seas, feeling the deck springing up and down like a teeter-totter, like the feeling you get on an elevated section of highway when you're stopped and a tractor trailer roars by on the far side.
Still, seeing a giant robot beat the balls off a Godzilla monster with a bunker tanker was awesome.