It's not a meme. It's a theoretical ethical dilemma involving an out of control trolley. Yes there are questions like "how fast is the trolley", "could they try and apply the break", "how close are you, could you untie one of them and not have to hit someone" you could ask, but the point of the exercise isn't to determine how you would save the people, it's what sort of choice you would make in this situation if you had just those two options.
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