Lancer, 1 was a bad example. 2 has happened to me when following an ILS down to a circling minima for a straight in approach to a runway with a displaced threshold. The final 400' or so of the approach (visual on temporary PAPIS) was way above the normal glide slope which should not normally cause a callout, however, in the flare the glide slope signal fluctuated a bit and the indicator briefly went from full fly down to full fly up and back. It caused a glide slope callout. Was it a surprise? Yes. Had we lost SA? No. Should we have gone around? No definitely not. In my opinion, if your immediate response to a callout is "why did it do that?" Then you've lost SA, on the other hand if it is immediately obvious what has happened then it is no different than a support call from the PNF.