Symptoms of a philosopher

I once heard it suggested that the sign of a potential philosopher is the ability to grasp the full force of the Euthyphro dilemma. I think that's a pretty good choice, actually, but I was wondering what other signals (or "symptoms") we might be able to come up with. Obviously understanding conditionals is a necessary prerequisite. More seriously, it helps to be able to abstract away superfluous details and take a thought experiment in the spirit in which it's intended. Fafblog had a wonderful post last year which poked fun at the pedantry typical of the literal-minded:

FAF.: Oh no Giblets! You have not been eatin pork to painful excess again have you?
GIBS.: Giblets does it... GLLGGLL... for national greatness. He stuffs himself with liquid ham... for the glory of the republic!
FAF.: But Giblets does the end always justify the means? For example say there is a man stuck in the opening of a mine shaft.
GIBS.: How would a man get stuck in a mine shaft? Mine shafts are huge.
FAF.: Well lets say he's a big fat man stuck in a mine shaft an there are like a dozen other people trapped in there because the fat man he is just so fat.
GIBS.: This is an improbably fat man we are talkin about.
FAF.: Maybe he has been eatin ham jello. For the glory of the republic.
GIBS.: Then he can stuff off. This is Giblets's ham jello.
FAF.: Anyway the question is should we blow up the fat man if there is no other way to get him out of the mine shaft to free the trapped an starving people inside when we know that blowin up the fat man is cruel murder?
GIBS.: Ha! I'd like to see you try! The explosives'll just make the mine shaft collapse an squish everyone inside.
FAF.: Giiiiblets, you're ruinin my moral dileeeema.

Well, okay, maybe they're also poking fun at the silly thought experiments we come up with. But all the same, it's a neat dialogue ;)

So, any other suggestions?