That's messed up. That guy is an idiot.
But in all fairness, the "Protected by Smith & Wesson" sign probably gave them away anyway.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/