Yea Ive broken ships in two with GW once or twice
Back on topic I think my favorite is not paying attention to the depth beneath the keel. Suddenly there is screeching, crashing, and flooding.... OH NO ! surface the boat.... blow ballast..... "Crash DIVE !" erm oops wrong button.. black screen.
I also loosed a couple of torpedoes before leaving dock by pressing enter (before I modded it out or GW even existed). Fourtunatly they dident hit anything.