Those were the three topics that were off limits for conversation in the wardroom of a warship. The thinking, of course, was that those topics are the ones most guaranteed to piss people off and, since everyone had to work together, comity and harmony were valued.
If you were determined enough to want to talk about your church or your political candidate, you could expect that in very short order, you would get a talking-to by the XO.
I find it's a pretty good rule to live by in conducting my affairs in the real world.
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