As far as I can tell, it's just healthy sportsmanlike interest. Like, "I went to the shop and a drunkard threw his bottle at me, so I waited for a bus on my way back." - "AHA! And what would you have done if there were THREE of them, and they had KNIVES?!" - "..."
That doesn't seem very healthy, unless it's said in humour. What's the point of drilling on impossible circumstances?
If it's worth saying, but not worth its own post, then it goes here.
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