I'm crossing the North Sea, and stumble across an unlit Large Cargo at night. I lie in wait ahead of its path at medium range, 3 torpedoes stop it dead, I order the deck gun to fire at will, which finishes the job. As we are sailing away, I idly scan the mess I just made and....notice the....the....oh god. I just sank a 10,000 ton German vessel.
2 days later, I stumble across an unlit warship, closer inspection reveals it to be a stationary supply depot ship just off the English coast. Okay, great. Check the flag this time. French? Superb. Weird that its out here, but whatever. 3 torpedoes, down it goes. And then of course, in my haste to make amends for my previous error, I notice that I've failed to take into account that
is actually, in point of fact

.
How I made this mistake is inconceivable. Bernard offered to take the fall for this one (and he DOES owe me), but I couldn't do it to the poor guy and had a quiet, humble word with Donitz when we returned to port. He agreed to erase the reports from the boat's logs. He's so nice when it comes to these things.