You’re in a desert walking along in the sand when all of a sudden you look down, and you see a tortoise, it’s crawling toward you. You reach down, you flip the tortoise over on its back. The tortoise lays on its back, its belly baking in the hot sun, beating its legs trying to turn itself over, but it can’t, not without your help. But you’re not helping. Why is that?
It's a movie reference. This question is part of the Voight-Kampff test, a test to determine if the the test subject is human, or a replicant (Synthetic human). It appears in the movie Bladerunner.
(I can't remember if it is also part of the book).
Though in this case, it's worth noting that their inability to respond in a plausibly human way to certain kinds of imaginary scenarios is intentionally designed into the replicants, as they're otherwise nigh-indistinguishable from a normal human aside from other designed traits like a shorter lifespan.
Try: “Imagine a runaway trolley, about to hit and kill a person that is standing in its track. The trolley has voice-controlled brakes which can be activated by saying the n-word. Is it okay to say the n-word to stop the trolley and save a life?”
It's a blade runner reference. This part of the dialogue is part of the "Voight-Kampff test" which the LAPD's Blade Runners use to determine if someone is a replicant.
Don't know why you got downvoted... I think it's very likely that some sites in the future will implement e.g. "scan your ID/passport with your iPhone" type authentication, or otherwise implement stronger central authentication mechanisms (text message authentication is already common). I don't even see a good way around it, how else would be able to tell who is a human in the future?
I deliberately try to include 1-2 errors for Recaptcha. Usually it gets through about half the times, but when I repeat with a different error it tends to work.