punkofnice: When I encounter these brain-dead analogies my response is to simply say "yes" very quickly and look as if I am politely waiting for them to raise their argument and missed it was an analogy to begin with:
Crawl to the door? yes. (wait).
Sister in iron lung with 10 bible studies? yes. (wait)
One should insist they make the argument in the actual situation and just ignore everything else as irrelevant. This is clearly difficult for them and the analogy is bound to resurface. Then I would politely say: But we are really talking about so-and-so and not a burning house, so perhaps we should talk about the actual situation instead? (wait for response; if the response is not a yes or no insist on the question).