Remember that great scene from Run Silent Run Deep when they make the night surface attack on the convoy? There's this one point when they sink a destroyer...it's headed right for them, but a merchant passes in front, forcing it to veer away, giving the sub a brief shot at the DD's broadside.
Happened to me almost exactly the same way a week or so ago. Found myself in the middle of a convoy cursing some dud torpedos...Fubuki comes tearing down at me, and I foolishly have the scope up to try for ONE MORE shot at a merchie before I have to dive or die.
Merchant I'm lining up on passes between me and the Fubuki...Fubuki turns to go 'round...I shoot at 600 yards without locking onto the target...boom.
Felt nice.