My friends and I talked about this one night after a few drinks. One idea was the SS SSSSSSS, because we only had an S stencil.
Mine would be called The Baconator, and its jolly roger would be a white, grease-stained flag with the image of a pair of crossed bacon strips behind a cheeseburger.
Edit: Upon discussing this idea with a buddy, we've decided that it would have an escort ship called the Double Down, and that there would be no captain, only a colonel.